It is a community-developed project, so it only really needs to appeal to developers. What motivation is there to attract non-technical users? Particularly ones who require lots of effort doing uninteresting polishing related tasks to keep them happy. Other platforms do this sort of thing because their entire reason for existing is to satisfy customers.
First of all, adjusting scrolling speed is not an "uninteresting polishing related task," it is a basic standard of usability.
Secondly, if you don't think Linux on laptops should be broadly usable by the general population, you are in the wrong thread. The central point of the HN post we are all commenting on is the usability of the Linux desktop ecosystem on commodity laptops.
Swaywm has the ability to set this (you have to edit the config file). It seems weird that gnome or whatever you use lacks this option. Although, gnome has a lot of t's to cross and i's to dot, maybe they just haven't gotten around to it.