The article also says why they suck:

> Dumb TVs sold today have serious image and sound quality tradeoffs, simply because companies don’t make dumb versions of their high-end models. On the image side, you can expect lower resolutions, sizes, and brightness levels and poorer viewing angles. You also won’t find premium panel technologies like OLED. If you want premium image quality or sound, you’re better off using a smart TV offline. Dumb TVs also usually have shorter (one-year) warranties.

Some of the advice is a bit weird though. Get a 4k HDR TV and then connect it to an antenna? I mean, why do you even need a 4k HDR TV in that case?

Not to mention disabling the smart/ad features is an option on some smart tvs (ie. Sony).