Who is going to pay for all the time to not only trace out what is what and then extract the (apparently, hopefully) ‘no longer needed’ gear (and related wiring), but also the time that will be taken up figuring out how to fix whatever gets inadvertently broken?

Sometimes stuff stops working just ‘cause you were jiggling other stuff around, even though you didn’t touch that particular thing.

There will also be the temptation to make things ‘better’, which means messing with stuff that is currently in use and ‘working’. Even if just to relocate and remount the exact same boxes in a more tidy manner and/or reroute the wiring.

I view existing/old high density, long history equipment closets as a minefield. If I touch it (or just happened to be the last guy in there), it automatically becomes my problem.