Also have been there and done that for a similar distance......Time for a new crank probably, at least I have never had any luck getting one to re-seat and stay tight even using loctite on the bolt.
Lesson learned. A few days ago I went over all of my main bolts/connections for maintenance. Guess which ones I neglected? Crank bolts! Checked the remaining crank bolt when I returned and the threadlock had deteriorated and crumbled like dirt. Not having a throttle would have cost me $35.00-$40.00 for an Uber, If the Uber would have taken my bike.
To have a throttle, or not to have a throttle is purely subjective. My E-MTB bike came with one, and it is essential to my off road riding terrain, my riding style, and my enjoyment. From my experience I would always prefer a throttle, than not. Certainly for my wife it has been a positive safety adjunct.
What does not make sense is Stefan Mikes directive:
"Don't even consider a throttle because I do not think you really need it."
Stefan is advising a fellow board member not to even attempt to gather opinions or anecdotal evidence from other experienced members, and to disavow their own critical thinking skills, just because Stefan has a "preference".
Hubris much?