I do the same, I use kodi on a CoreElec box on my 10 year old dumb TV. It works great, but my issue is it’s going to be extremely difficult to replace my TV when it gets time to upgrade. (Eg, if I want to move to an OLED, or QD panel). Every new TV on the market is a smart TV. It’s getting to the point that you need to buy a very large monitor, rather than a TV, to achieve the same setup.

My cheapo dumb tv died a couple of years back, was a great bit of kit for $400au that gave me 10 years. I’ve got a “smart” tv at the moment which isn’t connected to the internet, and just serves as the display for my Shield TV.

I’d probably consider an LG commercial / signage display as my next device, some old work connections can get me one as a special purchase through their distribution channels it’s just waiting out the current panel dying.