TBH vesc is brittle. Even VESC 6 are known for puffing magic smoke. TB is a big player and he moves a lot of vescs. The more you sell the more issues you are going to get and people usually get chatty when there are issues.
Here are the lessons I learnt.
Read the forums. There are small stupid things like how to prevent shorts. Vesc limits. (The damn thing is so configurable that if u programmed it to cook itself it will ask you how would you like it done)
Use well tested firmwares with wizards. Ackmanic is a good one
Buy insurance and use a trusted vendor. People will disagree with me but I had good interaction with @torqueboards and def trust them to have my back when shit breaks.
Lastly have patience. Shit will break. Shit will not work. It takes time to work out.
Also I fried 3 vesc on bldc hybrid. Zero on foc