Coming from a webhosting env. We dealt with hundreds of servers some of which were always moving based on contract changes.
I don’t care for them and prefer velcro instead.
IMO, if you’re going to pull a server from a rack to do something inside the case it should be off. Hot swappable drives are all accessible from the front.
It was one more thing I didn’t need stuffed into the back of the rack.
It added to install time, and removal time.
It made it harder to replace a bad cable in a hurry.
It blocked access to the label on the cables near the jack.
It made it hard to move a server and cables if say I wanted to move it higher up and shorten them.
It added to any heat problems we might have had.