Also GPU drivers.

If you're mad at NVidia for their closed-source drivers, then remember that ARM seldom makes their Linux drivers available for free, so you have to either have to deal with absolutely no GPU driver while the CPU does the graphics rendering (might not be a big deal on a NAS though), or with open source drivers that are less capable than the Nouveau drivers and even fiddlier to install. The ARM Mali driver issue is so bad I was legit thinking on a solution to run the Android binary blobs (which at least are available by ripping them off from the Android kernel) on regular Linux, a lot of function call redirects would likely take care of that issue.