In terms of development of stadiums, it really shows, that Adding more variety to stadiums or making a stadium visual editor is a low priority for SI Dev team.
Not sure if this related, but personally it is tied to what Miles said, almost a decade ago, that they do not want FIFA graphics... I don't like this comment, because, people say its lack of competition, SI is not pushing things forward in Football Manager. No its comments like this. And promote features that are ugly like Miles did with faces, as okay quality feature. No dammit, I demand more and better from SI. (demand is strong word, I know but I think SI can do much, much more and better). The Evolution should be more evolutionary then we have today. Its okay to do small evolution of features in FM, because the fans will buy it regardless what they do (yes I'm part of that demographic). They have no incentive to change their ways (developing and communicating with us), if the current way it is a success for them.
My only hope, is actually women's football will be a revolution in Football Manager, then the small evolution of fluff we had in recent years. But even that I expect more of the same evolution we have in recent years.
PS: I for one would be okay, if they say: "We have developing a new graphic engine with Unreal or Unity or a new in house Miles Graphics Evolution Engine, so expect little progress in upcoming few releases." I for one would understand, not complain about that. I would be eager to see what they would develop (and time to time they make a Dev diary video and share with us how progress is coming along, much like Paradox is doing). However what we currently have, of leaving us blind, doesn't help either.