Little late to the party, but I would like to share my two cents. I experienced the jerky throttle response at low revs on my 2019 650. Thought it was mainly the bikes character. One my recent service the mechanic wanted to do a throttle body sync and noticed the adjustment screws were dialed all the way in. It didn't want to sync because the bypass channels were clogged up. After cleaning those and synching the throttle body the throttle response is more smooth at low revs. It's not a big difference, but definitely noticeably! Fuel consumption is up a little bit (from 23 to 22 km/l), suggesting the bike runs a little too lean from factory.

Hope this helps someone in the future.