Realistically, the reason OEMs pre-install Windows has nothing to do with the storage space or even with the logistics for developing a "choose your os" program. It's that they get extra revenue from bloatware contracts.

Boutique PC or even laptop manufacturers are more than happy to provide Linux. They do not make enough machines to be viable for bloatware contracts, so for them it is often instead more profitable to get extra buyers by catering to niche user bases like Linux users.

and as a tech person, i would not care which linux distribution they choose. let the OEM pick one and use that as their differentiation point, if that's of any worth. ubuntu, fedora, suse, pop! os, whatever. it doesn't really matter, as long as there is an alternative to windows.