Edit: I owned both.
At the same scaling, maybe. But I use the high resolution display on my work-provided MacBook at 125%, which means a massive virtual screen estate gain.
I currently work on a MacBook Pro 13 and I switched from a XPS 13 with a 4k display. They're largely comparable, and the only difference I notice or care about is the OS. It seems that is how it is for most people.
(It's the old SE, FWIW. Bought a refurb to try iOS when my Android phone broke. But the repair for that was arranged right around when lockdown started so I've been using this for longer than anticipated. Not the polished 'just works' experience I expected, the a priori known restrictions on changing default apps, browsers, etc. aside.)
Setting a custom DPI only helps a little - side elements like nav bars do get smaller, but all the layout is still completely the same, like everything is designed for a tiny phone (which absurdly nobody makes anymore).
What are designers thinking? Is it really just short-sighted "look, we like content" and "but pretty", or is it something that actually improves UX for most people and just leaves me bewildered?
This is actually a paradigm example of Apple getting it right. Other manufacturers offer you a choice between a crappy low DPI display or an ultra high DPI display that drains your battery. Apple offer you a sensible compromise.
The prices between manufacturers aren't really all that different; but, if they happen to be important for you, Apple has a few features and components that others haven't been able to replicate at any price point, which is why paying the Apple tax is worth it to some.