In my case, I was fully remote for 2 years of COVID and have been hybrid ever since. We started at three days in when we returned to work and are now down to one day in a week.
If anything, my team has gotten more productive, not less.
Do I feel disengaged sometimes? Sure, but my employer treats me like gold and I have all the freedom I need as long as I do good work, respond quickly when needed, and honor my deadlines.