Somehow they don't trust the software developers with operating heavy machinery ๐
Anyways, I think we're moving away from the topic... At work I didn't encrypt harddisks anyways. They just put the servers into a special area in the datacenter that has a fence and a separate lock.
At home I just encrypt stuff so I don't have to remember what I put where and handle things differently. Of course everything depends on the specific scenario and threat model. I have a bit of stuff archived on my server that isn't around anymore, could be a copyright violation. I also have my complete life stored there, documents, finances, emails of a decade, pictures, backups for family members, passwords for emergency access to things. Admin stuff and logfiles that I'm required by law (GDPR..) not to share. I also used to travel a lot with my laptop in the backpack and that can get stolen. At some point a long time ago I decided to encrypt my harddisks and stop worrying. Since at least 10 years there isn't any speed penalty anymore and it takes like 20 seconds to set it up on Linux...
But I can also see why not everyone wants to do it this way.
Why don't you consider encrypting your NAS, if I might ask? Inconvenience on boot? Because that's one inconvenience I currently live with... After a power outage I have to fetch a keyboard and type in the password, since the mainboard doesn't have remote-management and I've never set up an automatic way to transfer/fetch the encryption key...