I swear to hell that this rule turns the remodelling of your vault into an expensive logic puzzle... Sometimes the game refuses to let you delete lifts when it is only connected to one room and the lift below...
I can understand stopping the deletion of rooms or lifts that cut off part of the vault but FFS, when there are multiple ways IT STILL REFUSES TO LET YOU DELETE ROOMS.
Please Bethesda, figure out how to let us delete rooms even if it means cutting off areas... Maybe make it so that the cut off area loses power and will only get power when you reconnect them. Maybe slowly radiate the cut off area. But please, PLEASE let us remodel our vaults how we want.
For example sometimes you add a room and realise it auto joins up and breaks the flow of your vault... so you go to delete it... AND IT WON'T LET YOU. Oh and on that matter, we should be able to chop out subsection of rooms that have auto joined together. Maybe let us split joined rooms up before deleting them.
But ultimately, GET RID OF THE RULE WHERE IF A ROOM IS CONNECTED TO ONE ROOM AND ONE LIFT SHAFT YOU STILL CANNOT DELETE IT.
EDIT: Oh and on top of that... LET US MAKE AS MANY LIVING ROOMS AS POSSIBLE... even though it is still capped at 200 peeps. Why? Well say you want to move a living room... Currently you have to kill off enough dwellers that will let you delete the old living room before it will let you put it where you want. REALLY bad design that.