Sounds reasonable, that's probably it...

I don't really like them tbh
if they're pages at the start or end of a chapter, then I can just treat it as a credit page and ignore. But in the center and highlight of the chapter? Unless you have god-like colouring skills or you replicate the mangaka's colouring style, please don't. Manga aren't colouring books lmao

They get in the way, but it's no big deal, if the colouring is well-done and the original page immediately precedes or follows it.

They're terrible if the above conditions aren't met.