I come from an era when unplugging the RAM pack could blow every chip on the ZX80's board, so hot-swappable PCIe cards are just absolute fucking black magic to me.
Yeah, I almost had a heart attack the first time I saw someone do a 'cfgadm unconfigure' && 'cfgadm disconnect'; then pop open the side of a prod box, press a button and pull a card out.
"See, oracle's still running!"
Things like that used to be how one distinguished enterprise hw & sw vs. PCs w/ delusions of grandeur.