I see! Thanks so much for the thoughtful response definitely seems like there's a use case for people who might be more creatives with a need for storage rather than self-hosting enthusiasts who want to mess around in a homelab.
The prices are still a bit eye watering but you pay for software support for sure.
Is the main appeal of prebuilt NAS cases the aesthetics and the reduction of DIY concerns?
Because they seem to me like overpriced and underpowered computers. Most tech-oriented folks I know have more powerful PCs in a closet somewhere that they could easily convert into a NAS
Edit: some very thoughtful responses thanks y'all! I definitely see the appeal for people who just need something that doesn't need tinkering or care significantly about power draw and noise.
Obviously everything depends on use case. I definitely am a tinkerer and prefer options. I'd never run a jellyfin server off a synology NAS cause... Well cause it can't transcode very well. So efficiency is less of a concern than processing power.
I get now that my questions was a bit moot, obviously some people will pay a premium for a narrow use case if it brings reliability and ease of use.