Yeah we can see that the navy is already incapable of protecting the shipping lanes as they currently stand. If we strip all the modern blue water assets to go die in the Arabian Sea right now then the already-chronic minor raider problems will be totally unanswerable, before even getting into something like Stahl or Bintang deciding to come out for a major fleet action while we're distracted.
I mean, in all fairness, I don't think our modern assets would just die; India's not omnipotent. A large, concentrated GDI force would stand up a lot better against Nod naval/air attacks than in a situation like the recent convoy battle. There, Bintang was free to commit all her assets and everything she's got, but
only if she thought she had a good chance. By contrast, in a naval battle to support Karachi, the enemy would be forced to commit even if they weren't sure they could win. Even an enemy like Stahl or Bintang* is less of a threat if they can't pick their battles freely because they have to act in defense of a critical target.
At the same time, the point that we'd be totally screwed by Nod naval raiding hitting us all over the world while we
did that, even if it went okay in the Arabian Sea in particular... So I don't disagree with the conclusion as such.
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*(and we don't know if the Indian warlord or their subordinate commanders are that good as tacticians. Remember, India hasn't actively been to war against GDI much for a long time, and that comes with both advantages and disadvantages. They have relatively intact forces and we aren't familiar with their capabilities, but on the other hand, they don't have a lot of experience against
us, not directly)
Battleships are designed to take this kind of damage and keep going. So long as the citadel remains protected the ship can continue functioning, if not all that well. The worst this does is knock out things like radar and AA guns.
...as you would know if you read the paragraph right underneath the text you quoted.
On the other hand, the ship's pretty well combat-ineffective without radar, and a sitting duck for more missile strikes without the defense guns. And as we saw, even if the battleship 'keeps going' in the sense of limping back to port after maybe managing a few lucky hits on the enemy, there's a good chance of it being a constructive total loss, in which case the extra armor and all didn't do much good compared to what more lasers and long range missiles might have accomplished.
Will the replacements have the various upgrades and new techs we've researched or will that require us to take a refit action at some point?
Like we're probably researching the heavy laser for ships (specifically frigates) and AA defense next turn.
Will Governors and battleships start having those as well?
If we need to do a refit, we do a refit when we can. Priority is getting the
Sharks rolled out with modern lasers, though, because then we can thicken task force defenses and have ships covering each other better.