Workstation computers can be a joy of simplicity, as they're intended to be very easy to service. But this comes about because they're full of proprietary parts, so IMO you've got to be happy to accept them as-is. Otherwise, as the article shows, you've got your work cut out.

I'm a PC tech who grew weary of figuring out which panels need to be removed, cutting myself on sharp metal edges, trying to distinguish between the five different types of screws needed to hold the various internal components in place, having to remove the CPU cooler and (what feels like) a quarter mile of cabling to be able to replace the power supply, etc, etc. And as it happens I've just replaced my old HP Z600 with a Z620.