OK I simplified a little, but if there was ever any reason to move a rack and it could be done with zero downtime, the arguments against it are never going to be "but that's my space I rented".
I rent a furnished appartment, and while the company that owns it would never touch it without my permission, the contract is very specific about it being this building, they would never say "mind moving next door?" whereas with a rack in a data centre, not only does the contract not specify exactly where the rack is placed, it makes very little difference about it's exact location.
I rent a furnished appartment, and while the company that owns it would never touch it without my permission, the contract is very specific about it being this building, they would never say "mind moving next door?" whereas with a rack in a data centre, not only does the contract not specify exactly where the rack is placed, it makes very little difference about it's exact location.