I agree, the price for squinting has earned itself an expensive price tag. However, majority of the time, I work with 4+ windows open at a time, and this is fine and dandy when I am at my desk with my dual monitor setup. When I'm on the go though, the only times I'm using my laptop, my 1080p screen greatly limits my ability to view 4 containers simultaneously, and I prefer the 4k laptops for that. It's more screen real estate for the price of squinting sometimes, but personally I have a huge appetite for screen real estate.
That aside, I mostly agree - for gaming, don't need 4K. For youtube/movies, don't need 4K. It's kinda nice to be able to hook into a 4K TV, but I frankly, I never end up doing such things anymore.