I too hate the 'mesh' marketing scam. The only true mesh system ever made was made by Meraki, and it is was stellar--APs would talk to each other in a true multi-point manner, self-heal, and could have a wired backbone. I still have about 14 OD2 Outdoor units that worked flawlessly for years--but at 11Mbps max wired backbone and 5Mbps max wifi, they unfortunately have become too slow for today's demands.
Meraki discontinued their Indoor and Outdoor units many years back as they created new products and were being acquired by Cisco. I still miss their system and the excellent management it had (web based) and how robust it was. The system would tell me when it had issues, but would actually self-heal in the meantime--it was absolutely brilliant.
The closest thing to this today is a Ubiquiti setup, but it still isn't as robust as the old Meraki system.
Consumer mesh maybe uses some of the same technology, but it's really just a bunch of repeaters that cost a lot so they work. There's nothing special about them that a proper network configuration couldn't solve. But it has that fancy packaging and a big price tag so people buy it and are happy with it. If they only knew what you could get in real networking equipment for the same money. But hey, that's consumers...
As far as addressing your question, wired > wireless, so if you can wire it, most definitely do. And that includes your devices too. TVs never move so wire them via ethernet, powerline, or moca. Desktop computers don't move either so do the same. Not only do you improve the internet on these devices, your wifi is clear for those devices that need it so their performance is faster too.