I think you can delete the bits about TW/TKing in Bannerlord. And because of that your excellent Warband advice on fighting multiple enemies isn't quite as effective since the enemy doesn't have to worry about hitting their team mates. But it does have the element of surprise, and you might get a hit or two before you are cut down.
In Bannerlord your best tip is to stay with your teammates. If you find your friendlies getting thinned out, start pulling back until you have the numbers again, then start pushing again.
This is for skirmish, where teamkilling does happen, though.