That's the rub though; I agree that work should be rewarded. Goals should also be realistic and attainable. I fully support SE using grinds in this game and content like Eureka where players afk'd through infuriated me.
But, see realistically attainable. You can tell me plots are on other servers. I HAVE to talk about the negatives if they're going to disrupt gameplay, so; which? What language? Am I trading the ability to play comfortably for it? Is mch/nin/etc going to be impossible to enjoy in this new area? Am I trading the ability to converse with half the server for it? This has now gone beyond realistically attainable and entered possibly game changing, before we add in losing friends and raid groups.
So, while in theory just transferring is the best solution, in reality it is not so clean cut. And hanging onto the fact that somewhere, scattered amongst smaller servers that possibly speak languages I'm not familiar with, are a few hundred homes when there are probably twice that number at minimum waiting on more housing... does not work for me.
You talk about buying homes from fc's, which leads to an fc of one and then suggest having huge ones to make sure... What? That there's a house for each fc if we consolidate them after allowing the individual spots? I'm not sure what this argument is for. Still, in theory it works well, I'll give you that; in practice I think we'd see scamming and people booted left and right like a few large fc's on Levi I won't name. It's part of the reason we see so many small ones.
Also pardon? How would houses being finite or not NOT effect this? There are worlds where they are not released back to the market everyday. If they were no longer finite people would not be this upset, because like most content in the game, it would be a goal that could be eventually reached just through grinding. As someone who apparently likes the idea of rewarding hard work and grinding, I'm surprised you are not more for this. (Although probably at higher prices and tbh, if Ishgard isn't instanced I really do hope the plots cost more.)
I couldn't say for 100% what people are most angry about. SE told us personal and fc housing would be separate; it was not. They opened more wards and promised first dibs to fc's- pre existing home buyers were able to move too. I would agree some people are angry because they just WANT it, and now, but I know there are plenty of people waiting with gil in hand for more housing.
Again, I agree that a grind is good, and we should work for things in game. But those goals need to be realistically attainable, and not at the cost of how you play your game. Server transferring is not going to be an option for everyone, and honestly should not be the only option besides paying someone else for a home. Nothing else in game is finite like this, and that frustrates people too. You want the Seiryu ex mount? Grind 99 totems. You want a house? Hoo boy good luck.