They are and that's part of the reason why it matters.
144/24 = 6
120/24 = 5
60/24 = 2.5
TVs compensate by showing you every 2nd image longer causing a slight but noticeable judder effect. Panning shots don't look smooth etc. Much like font kerning once you see it you can't unsee it.
Plus ofc other uses like gaming. And frankly I also didn't want to set up a home theater with half the tech modern, the other half not. A bit like you want your PC screen and GPU to be paired well and not a 1080p screen with a 5090...