With all due respect, I don't believe you are familiar with RMS positions. I'd argue most people who have not followed him closely and haven't carefully listened to what his PoV is, have a very hand-wavy understanding of the nuances of what he stands for. The fact that you talk about open source is the tell. The term "open source" was deliberately invented to de-emphasize what RMS cares about in favor of a business-friendly justification for why it benefits businesses to share source code with others. Open Source philosophy is not about emphasizing the user rights and ownership over their computers.

And yes, he is concerned about microcode--he still uses a Core 2 Duo laptop that can work without the microcode blobs in firmware, as opposed to more modern processors, for that exact reason.