The bit I'd call unprincipled is giving a pass to software that is baked into hardware, and hardware modification in general. This is pure pragmatism from the world of the 90's, regardless of the stated justification.

This crutch allows RMS to avoid having to work out an approach to analyzing systems which are combinations of libre, non-libre, and someone else's domains. And due to the rise of everpresent network connectivity, analyzing these combined systems to figure out how libre software can be used to create the most user freedom is more important than ever.

In RMS's terms, such systems just seem to be considered "unethical; avoid" and his thinking stops. This isn't particularly productive when overwhelming commercial interests herd users into those types of systems, network effects keep them there, and many are part of real businesses that can't just be forked.

Libreboot has said "given that goal, we believe that the FSF's RYF and FSDG policies are problematic and partially undermine the goal", and the FSF has said "no, we believe that our RYF and FSDG policies are the best policies at this point in time, and Libreboot's non-compliance with those policies partially undermines the goal". But both sides agree on the goal.