https://www.theregister.com/2022/07/11/raspberry_pi_desktop_...
RasPi Desktop is the x86 version of Raspbian. It's exceptionally lightweight, uses just 200MB of RAM at idle, and yet it's just Debian and will run any Debian tool or app.
It uses about 1/3 to 1/4 of the RAM of any Ubuntu flavour, and I've tested them all and published the results:
https://www.theregister.com/2022/08/18/ubuntu_remixes/
Some Redditor did the same for Debian with comparable results:
https://www.reddit.com/r/debian/comments/qmbizl/real_measure...
Raspbian PC's usage is lighter than stock Debian + LXDE, and it comes nicely preconfigured.
It's easier than Debian, smaller, and uses less resources. What's not to like?
... I reckon you're likely to take the path of least resistance and use the one that's right there and you know, rather than start learning something else.
Bear in mind his perspective: he's old, he has limited time left, and he's built not one but two better OSes that should have replaced the first OS he built: Unix.
So he probably is disinclined to spend time or effort on leaning a 3rd party knock-off of his 1970s work.
If you use RasPis, why bother to learn any other knockoff?