Years ago I remember KORG producing an M1, T1, T2, T3 synths all covering different key sizes....in today's world the 88 is the least wanted by players vs the 61/76, or even the 73 for many reasons. 88 key arranger kb ...It's just not financially beneficial to a company in today's market if it was they world be making them....with all the other great alternatives its a dead fish in the water. Imo piano players vs arranger players are two completely different categories and style of players and here lies the reason for less 88 key models..
good luck in your 88 key search for the future.
But imo the 88 key controller kb of your choice and something like the Ketron SD 90 module would make alot of sense especially for the bedroom player.