Most 4k tvs, or at least the 250 dollar TCL model I have, support 4k at 60hz over the newer hdmi spec. It works fairly well as a large monitor, even when sitting up close.
Personally I don't think I'll ever get a <=60Hz monitor after using one with 144Hz. (Caveat- there aren't many 4K 144Hz models the last time I checked, and they're quite expensive. I'd rather make due at 1440p, any day!)