If you read the original reddit thread, you would understand that this is not just a drivers issue. Lenovo intentionally programmed their BIOS so that it reverts any changes to RAID mode making it impossible to install Linux.
On the other hand, Microsoft could have easily gotten a much more "robust" lockdown - by simply demanding mandatory, unchangeable Secure Boot like on the ARM tablets. But they didn't do that.
Didn't you hear that Secure Boot is basically broken?
Flagged as a dupe. It's here: https://news.ycombinator.com/item?id=12545966
I'm sure anyone with enough knowledge to decompile a BIOS would have obviously thought of that idea though. I'm guessing the BIOS images are signed or something?
Regardless, this smells evil to me...
Edit: it'd be rather amusing and saddening if this whole controversy was caused merely by someone misunderstanding/misreading a perfectly sensible requirement to disable the RAID mode, and instead disabled the other options. Given the level of communication fluency among some programmers, I would not be surprised if this were the case; and the fact that the machine still boots into Windows because it has drivers might've let this slip past QA...
Sure, real/standards-conforming NVMe would be better -- and wouldn't require driver shenanigans in either Windows or Linux -- but there should be a performance advantage to 'RAID' mode in this case.