LOL! Sure you can record in 4K, try broadcasting that over the airwaves as they exist today.
Which is exactly why everyone is moving to cable, fiber or satellite. 4K TV’s adoption is a bit slow but it is emphatically coming.
I watch some 4k nearly every day now, YouTube and Netflix. I live in the mountains and do not know of this broadcasting you speak about.
Sort of joking, haven’t been able to see broadcast TV for over 3 years now. There are several YouTube channels I like that are 4k and are noticeably better than 1080. The average person will never broadcast their video over the air but I have several friends that put video up on YouTube and 4k is getting relatively common there.
But, however and otherwise, I think 1080 is fine for personal use and is much less resource intensive. I have an inexpensive phone that shoots 4k but I always use 1080p, I don’t think I will regret it even 10 years down the road.