Do I *need* to run "sync history" for Garmin?

Support Activity/Sync Issues
1

I can’t find anything in any other threads, but do I HAVE to run the historical sync?

Everything in my Garmin Connect is already on Strava.

Can I just pause Strava (my last Strava run, pre-Garmin Authorization) is already uploaded, and Garmin will work from here on in?

2

You don’t have to run your full history sync.
Some people didn’t want the full history sync, so I made that optional for existing accounts.

Yeah, you can/should pause Strava so new activities will only come through Garmin. That will help the API situation a lot!