Thought I might be able to shed some light on the synchro issues. The synchro TSB is due to excessive wear as a result of shifts that do not reach "full travel." I'm not sure about earlier models, but there was a run of 2016 and early 2017 shift towers that causes this. I had my shift tower replaced twice. The first time they just did the synchro, the second time they also replaced the transmission but that seemed to be unnecessary. And due to some sort of time/cost.
As far as the shift tower is concerned, there were apparently some bushings that were out of spec and caused a one of the rods to slop and flex, not moving the forks completely and thus causing the excess wear on the synchros.
Also, don't let the dealers tell you it's because you don't know how to drive a stick. The service writer at the dealer I took mine too gave me that and then proceeded to stall it while pulling it out of the drive through.
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