I can count the number of times I've actually sat down specifically to farm essences on one hand. Idk if I just spend far more time in Bozja than I've realized or what, but I'm swimming in most of the essences and actions I care about just from passively doing the content. Heck, some of the cheap essences have 100% droprate fragments you can farm, though I'm guessing that's probably not all of them.
I mean if you don't wanna sit and farm that's your prerogative, and if you aren't spending much time in the content anyway it probably doesn't matter much. But if you've got them, there's no reason at all not to use them, and the more people DON'T use them, the longer every single run is. The difference in speed between a group with people even half trying to use 'correct' essences and a group where most people aren't is... not small.
I mean I'm lazy af when I go into Bozja now... I never take off Seraph strike, I'm drowning in aetherweavers and profanes, and the only finite resource I need to worry about at this point is chaincasts. I do stupid amounts of damage with close to zero effort and it's fantastic.