> 1) Cultural norms - This may not work in all environments
If you have the luxury to pick and choose, going to a company where that works is a huge improvement at large.
In my personal experience at least, I've seen no place where the "let me quick call you" is a norm and engineering is also decently respected and paid appropriately.
> 2) You have an issue which requires cross function help. Hard to frame a precise question when you don't know which features are the most significant.
You'll need more investigation either way, I'm not even sure you'll be able to properly decide who should be part of the meeting. The whole "who should I talk to" can be potentially be done better by chat, where you ask a whole group at once who's concerned by your problem and further narrow down as you get pointers.
Messaging a whole channel at once will probably be better accepted than inviting random people at a meeting to realize none of them were concerned.