We never see any of them acting like the Personal Butler that Honor's is presented as, which is what I was getting at. Sorry for not being clear at all it seems. This is perhaps because nobody really gets any sort of focus outside of Honor and a few precious others.
At this point, it sounds like it's kind of a nitpick.
Imagine if there were ten novels centered on Aivars Terekhov, as opposed to being part about him and mostly about the cast of lower-deck characters around him. I'm pretty sure that then, his steward would probably get a lot more attention, about as much as MacGuinness.
I really don't think that MacGuiness is
remotely the biggest or most serious problem with Honor Harrington, and I don't really even think he's
A serious problem at all.
I don't see any evidence that she is, as you claimed, getting specially privileged service compared to other RMN officers.
Granted, we do
see the service given to her much more often, but that's also because, well, she's the frickin' main character of the series,
of course she gets several times more screen time than any other character! And she's particularly likely to get scenes that boil down to "one character sitting in a room alone and thinking," which is exactly when you expect the steward or some other tertiary character to show up and Do A Thing just to break up the monotony.
I suppose you could call it protagonist-centered morality. Which i wouldn't mind so much if the author didn't feel the need to TELL us, at least once per book, about how she's THE BEST and everyone who fails to grasp her righteousness is a filthy coward/inbred aristocrat/greedy oik. The one time we hear some of her (newly arrived) crew give a more balanced opinion (she's a glory hound who'll get us all killed), they were promptly declared Stupid and/or Evil. Seriously, is she EVER wrong?
"Steward," in the US Navy, is just a duty for the cooks; one or some of them gets detailed to the Officer's Mess, to cook, serve, and wait on the officers, in addition to their other duties. Presumably a Senior Chief (senior in rating, probably been in the Navy longer than Honor) has other tasks besides waiting on ONE officer. Oddly, this would make sense; he spends most of his time doing paperwork, handling logistics, and training/yelling at the junior cooks; this is his chance to actually do what he enjoys, so he puts a personal touch to it. No way he'd be following her around, though. It's not like his character ever develops.
To be fair, the RMN is explicitly an "aristocratic privilege" institution. It is entirely possible, even likely, that they will have some institutions that are heavily shaped by the desire of aristocratic scions to have things that a service like the USN wouldn't have. This includes personal servants for officers, or a deliberate redefinition of the role of 'steward' and the conventions around its role as a posting to ensure that a well-liked steward can indeed follow a senior officer from post to post.
"Things don't work this way in the real US Navy" is not a sufficient argument that there is something
wrong with the writing in having the RMN do them differently. For instance, the US Navy is particularly 'dry,' averse to any kind of alcohol aboard ship. This is not because it's objectively disastrous to have, say, beer and wine on a warship. It's because the US Navy's policies on the matter were forced into place by a specific
temperance fanatic and the subsequent Prohibition era, to the point where they sort of got locked into the idea that this was a hill they intended to die on. Another military service that simply does not trace much institutional tradition to the USN would almost certainly be less straitlaced.
If we're talking about Honor being wrong... I can't remember if the narrative ever acknowledged it, but wasn't Honor introduced as a member of the traditionalist faction of military development in the Hemphil vs White Haven dispute from the early novels? The idea that 'wonder weapons' are folly and the best route of military development is regular incremental improvements to the current weapon systems like energy weapons. She was completely off that mark on that one. By the time I bailed on the series, new wonder weapons had completely revolutionised space combat multiple times.
It always amused me that in Book Six,
Honor Among Enemies, as she was flying
Wayfarer, the first podlaying missile combatant to see major action in the modern era...
Honor gets a look at an Andermani capital ship, and her thought is "gee, I think that design is maybe too missile-heavy and might suffer in beam combat."
And I'm like, oh, that's just
cute. It's the same way I feel about Weber presenting the "all-graser" armament of Grayson cruiser/battlecruisers as some kind of significant innovation. It's like, buddy, you've just written beam weapons as entirely obsolete in an era where typical enemy weapon ranges are 50x or so longer than the distance any beam can reach. Nobody cares about the grasers anymore.
Honestly, the objectively superior move might be to replace most of a ship's energy armament with lighter, quicker-firing lasers that may not be as fast-firing as a point defense cluster but are still credible as secondary missile defense weapons. A ship is far more likely to fire its beam weapon broadside as desperate final antimissile defense than it is to fire it in anger at an opposing warship, after all.