I wonder how many average consumers are privy to the fact you shouldn't update your system
Are people out there really thinking their system is getting more stable?
Each update is another chance to patch a security vulnerability that may enable homebrew
That's some really busted logic you got there. You basically just implied that updating a console period is factually always bad, and that exploits being fixed isn't a form of stability. You also imply that every person using a Switch has or wants to run homebrew too. Wrong on all three counts.
Homebrew support isn't on Nintendo's todo list or radar period to support in any official capacity. They release firmware updates to address compatibility issues, fix bugs, fix security exploits within their infrastructure, or on the few occasions, add new features and or options. By definition, they are doing their job by supporting their platform and making it more stable. Just because it gets in the way of you running homebrew, doesn't mean that people aren't getting stable updates at all, or that each update is bad. It's a bad day for a homebrew user maybe, but that's just isolated logic to the end user, not a fact of reality with the general premise of things. You want a factually bad update? Consider calling out updates that negatively impact performance in some way, or cause very janky issues that didn't exist prior to said update, making the experience somewhat if not entirely unstable / unusable.
Boohoo if the update breaks an exploit, if a user decided to update the system, despite wanting homebrew, that's on the end user, not on Nintendo or anyone else. The user is the idiot. No victim here.