Re: Let me guess...
"Some ATO beancounter didn't like that the HPE engineer left a gap and wasted a Rack Unit."
I hate it when idiots (telco people in my experience) leave a 2/3 unit gaps or have installed the patch panels starting from rack hole #2 or something similar. Or the rackable 1U router/switch is put on a 4U shelf instead of using rack mounting. Or cabling short distances "temporarily" with the 5m cables because the short cables weren't available. Or cabling over other equipment without even trying to route the cables. Or installing servers without cable management and the servers can't be pulled out because the cables are stuck and way too short.
Worst case was at a client where a server was rack mounted and several servers were piled on top of it without rack rails. And the bottom server of course needed some physical service.