Took a while but I found a decent dumb tv to buy. It’s working well for me but some folks have said the lifespan isn’t super long since it’s an off brand with a four star build quality.
But the damn thing turns on in under five seconds and the picture quality is great.
I did the same thing a couple of years ago. Both of my older dumb TV's bought the big one within weeks of each other. So I searched and found 2 new dumb TV's.
We rarely use them for anything other than casting from the unofficial streaming sites. When my inlaws visit they watch broadcast TV on them.