Could SE make the notification more visible? Sure they could, and I am not going to defend this and neither am I in my post.
On the OP and them using this as the reason they quit, I don't buy it. In SB there are other reasons for quitting this game, reasons for which I took a long break from this game myself and that reason is... the content DESERT!!! (To explain it with few words and a bit of screaming in the end) I mean, this expansion is the one to date with by far the least amount of content, on release and later on. So quitting over that I would understand but over a feature OP did not use for more then 80 days, but to chose that as the hill your want to die on when there are plenty of other hills to charge, well I guess that is your choice to make.
The real problem with housing in this game is imho the fact that it is not open for everyone. I think FFXIV is one of the only mmorpgs with housing where it is limited, and the only other one I can remember is a sandbox mmorpg where you build your house out in the world and having housing limited in that case is something I get, but using a instance system and still have it being limited is just... going to be diplomatic here and say bad.
If they say "its the ps4, it cant handle it" then I just have to wonder, how come other mmorpg that also exist on console manages to have housing systems that do not exclude due to low availability?