Im wondering what kind of tv to look for?
IMO 4k is useless because the network where I live is bad and 1080p is good enough. I don’t think smart tv functionality is a thing to look for, more like a « what not to look for » criteria.
What other criterions should be taken?
IIYAMA make DSDs that are 4K, although I know that’s not a requirement for OP, so that should be able to replace a TV pretty well