I'm not sure what are you even trying to argue about.
Larian IS NOT going to give up on that type of "convenience" feature and no amount of crying and moaning is ever going to change that.
There are two options here: suck it up as it is or find a compromise that they MAY be willing to consider because it doesn't disrupt a feature that they've been adamant about wanting in their games ("competitive co-op" and the freedom for each player to go on their own separate way).
On the other hand, the insistence of having mandatory engagement in the initiative queue for anyone inside a certain range is a lot more reasonable, because it's contextual: if you are far enough, feel free to mind your own business, if you get close, stealth or not, you are sucked into the turn-based mode.
And you can push this last point because the only objection from a design standpoint there would be "What if my companion started shit and I want no part in it?" to which we can answer "Well, tough luck, sucker. Look for better company next time".
If I go around with a friend who starts throwing haymakers to passing people, I can bet my sorry ass that I'll be involved in a brawl/street fight even if I wanted no part in it".