I've looked into those when I was setting up my living room and, while PCs have their strengths, they lack things like CEC support, proper support for a remote

I've looked into those when I was setting up my living room and, while PCs have their strengths, they lack things like CEC support, proper support for a remote (which you can work around by using Kodi), apps like Netflix are hardly supported and getting them to stream 4K, HDR or even just to use Dolby is an exercise in futility. Not to mention that those setups tend to be pretty unstable. A technical user can definitely patch something together, but it will be a far less stable or streamlined experience and if you try to have your TV used by your non-technical family, good luck.