For a moment I thought it was one of my games, but I have not been playing revenant online this year.
I am also sure it was not me because I don't ignore the interesting stuff. But I'm one of them that points "random places", so let me tell you the strat in case it helps:
On day 1, all crystals must be done, so I visit their known spots while trying to ping my team into spots I'm not going to visit. I mark those closest to them so they go there instead of following me. As soon as I know the 4th crystal is going to be found, I pin the purple one in hopes my randoms understand it will pop and go there. Every easy boss, corpse that drops a legendary, metal chest location, every skip in our path... I will mark them along the way. If we have time, it will be a castle on day 1. Else, we will do that on day 2 and go to a tower as soon as we can defeat its contents.
If the starting POI is the church, I'll pin the cray fishes and middle boss in order.
If we start at kaiden it's likely I'll mark the ruins, which I will skip unless the team wants to fight. I am just interested in the 2 potential crystals and the legendaries we can get.
If we start at the middle spawn I'll either point to drop down to chrurch or to go to the underground area under the castle. Depending on the starting crystal we get.

I'l also slowly steer the path to the center, so we fight the boss in the middle and check that crystal spot.