The most rabid defenders should perhaps step back and see that the criticism, valid ones at that, it is no longer write speed, it is about narrative being hopelessly held hostage by the mechanics of the Forge
Give me one example of a poster criticizing purely CF mechanics in response to a recent chapter, and not just wanting for Lord to skip all narratives except for the ones poster interested in, and be damned all who interested in what will be skipped.
CF mechanic actually doesn't make that much of a difference on how Lord writes, evident by word count being lavish to say the least, even in interludes where CF is disabled. There are criticisms of narrative getting stopped to "look at a shiny new perk", but those criticisms come from assumption that the only thing that counts as narrative is dealing with the next big thing (ABB, Coil, S9, Endbringer, ect.), while completely disregarding the fact that perks are not deviation from narrative, but part of it, one that both integral to the premise of the story, and one that a lot of people, about who criticism like that forget, exited about perks rolls, description and usage, because that is the narrative they're looking forward.
You're right that BCF is not a thing with tight narrative progression. But you forget that this story has more than one narrative. The reason that BCF's "main" narrative of Joe dealing with the plights of the world moves so slowly, is becouse it also tells a narrative of Undersides being in the shitty place, of Brocton Bay trying to recover from disaster, of Taylor dealing with her issues, of New Wave imploding, of Capes learning about Shardspace and what awaits them after death, of Uppercrust's healing, and hundreds more. And each one has some people interested in. So while frustration of story's focus shifting from narrative one interested to other that one considers boring is understandable (I've been waiting for Kamuification for MONTHS!), it's not reasonable to just demand for Lord to skip all "boring" parts so that one can see just what they want, becouse other people also read this work, and they have different interests.
BCF is a slow, unfocused mess, that has waaay too much on its plate. It has a lot of undeniable flaws, it's reasonably infamous. But most people who stuck with it for this long might have developed Stockholm syndrome and love it the way it is, to the point that if Lord suddenly change the pace of the story and starts to skip parts of the story just to defeat 9 faster or something, there will be an uproar. BCF is slow, but it is slow for a reason, and people love it the way people love their pet snails (Speaking of which, Super Sea Snails were forgotten about). There is no other fic that explores
everything it can so thoughtfully.
But yeah, disclaimer for new readers would be a good idea. BCF is a very niche thing that I most definitely would not recommend to just anyone. A lot of people would not like it for a good reason, so disclaimer could help them save time.