I disagree. I have an aging 12" 4K laptop (Toshiba) and it is absolutely glorious compared to non-4K. It get amazing sharpness. I have 3 workspaces:

Full screen Sublime, full screen tmux and a full screen web browser.

It also drives another 4K monitor when I'm in the office.

I really want to find something to replace it when it dies but so far I can't find anything that works well and does not look like someone's go to market product