Since you do some streaming anyway, why not just "cut the cord" (so to speak) and probably save some $ by ditching cable TV service (and replace it completely w/ streaming and whatever else)?
There are various options other that probably provide equal or better quality/service than your cable...
I don't do cable TV -- have only ever bothered for 1 year long ago after my college days (unless you count something like SlingTV, which is cable-like streaming) -- but I'm pretty sure it's not worth bothering to get 4K from cable. As you noted yourself, 1080p cable on your OLED looks better...
Well, while I certainly wouldn't argue about the value of going Atmos, such statement(s) seems a bit presumptuous and probably overly judgmental me thinks.
I would say though that @Mike Up may also be a bit over-the-top in the other direction(s) (likely w/ plenty of selection bias to support...