I'm experiencing the same issue - my trackpad suddenly no longer clicked. Implications: unable to drag and drop, highlight text, click. Caveat: I did not download Big Sur or make any other changes. I took the advice above and rebooted my computer and it is now working. I hope this doesn't happen again. I would value an Apple-initiated response.
PNW
Users receive reputation points by contributing quality content to the forums.
Posts include post and replies published on the forums.
Post authors can mark replies as Accepted to indicate successful solutions.
Apple Developer Forums admins can mark replies as Apple Recommended to indicate an approved solution
User for