Software vs. hardware means you trust Microsoft to never in the future decide to spy and to never make a coding mistake that could turn the equipment on when it's not supposed to be.

When it comes to teardowns you trust that multiple independent parties aren't all actively lying to you in concert.

I don't see how these are at all similar.

When somebody figures out how to leverage a buffer overflow exploit in order to create a camera or microphone where none exists, then the might be similar.