So, my current "style" or "method" of fixing the issue with the people hanging out above the crypt is to place my toons around the venue, use eldritch blast to shoot the guy standing on the box down to the ground (I'm usually level 3 when I get there, because I do... things), kill two more with the falling stone and the rest is usually done at the end of round 1.
Good, good. Thats my example here.
Honestly, I think the game should add tactical tutorial material to the prologue ship, showing off a little bit whats possible, by guiding the player some more. Solasta has a very nice introduction to this topic.
Why did I use my example?
Because this is exactly what such a tutorial should teach - thinking out of the box, forcing the player to really use whats available, not let people "drift" into the mindset of "ok, here are my spells and my skills, I need to spam them to fix the problem of bad guys existing".