To reiterate what I said elsewhere, this Mac Mini is meant to be a desktop, not a media device (or some sort of perverse NAS). It's being pushed into the home theater niche by people who probably have a big trashcan Mac Pro at their desk and try to justify this lesser device. But it's an extremely competent legitimate PC for most people.
I maintain that if LG or Sony offered a “Pro” version of their OLED that had no apps whatsoever and no internet connectivity I would pay a premium.
Smart TVs and Roku boxes simply cannot be trusted. I have a brand new, relatively expensive Sony smart TV and while its Android TV support is more than adequate I don’t use it at all and keep it off the internet at all times. Instead, I use an Apple TV 4K.
Which is what I'd do but unfortunately Google insists on using it's own video codec for 4k instead of H.265. Meaning your 4k AppleTV can't play YouTube videos at 4K. My smarttv can though... We use AppleTV for everything else.
Media PCs never stopped working, and they're still better at some things. They're just less "convenient" in some ways, and requires more investment, both in time and money, which is why some people switched to streaming boxes or simply using their TV's software.
The sad thing is: This has reversed. I gave up trying to Netflix and Amazon Video from my HTPC. The former at least has an app and now even supports all formats (Dolby Vision 4k, Atmos), but the controls are terrible for a remote. The latter doesn't even have an app, and all you get is HD+Stereo. And don't get me started on Blu-Ray.
An iPad can’t though. And NAS’s don’t generally support transcoding.
A DLNA compatible media server can stream content to any device on the network.