In general I don’t believe in stacking (Anarchy). Even less for Peak runs. If you can’t open it “bare” they’re will be a better solution at high stacks. And should be at high enough stacks by the end.
Maybe for Raid Bosses.
It probably depends on what the player is doing? If they’re repeatedly farming a single boss (which appears to be fairly common in this game), going into that single fight with no stacks means “wasting” some time and ammo while they build up the stacks to begin damaging the boss at a rate that they prefer (since a failed drop tends to mean restarting the mission and ditching the stacks). Presumably the time taken to pre-stack is less than the time to kill the boss without this starting stack?
For general mobbing/story quests (which involves dispatching numerous enemies, sometimes on the way to something bigger), the stacks pile up before you know it (even for runs up to OP8, which appears to be the gist of your post).
Pre-stacking is something I might consider if I was going after raid bosses solo regularly, but even regular mobbing/story missions at OP8, pre-stacking is just… eww.
If you’re guns are decent you shouldn’t need to pre stack. Just mobbing builds stacks quickly if you don’t die or go into FFYL a lot. Farming bosses i would never pre stack, but maybe if i did raids i would
I remember when Gaige came out and I’d stick her in front of the dummy with a Striker and an elastic band over the fire button. Then I’d go make some coffee and come back to 100+ stacks. What a bunch of silliness.
Apparently PC players have a “method” to jump into the game pre-stacked and while I understand doing this for Time Trials, that’s not my idea of playing the game. My solution is to not raid with Gaige.
All of my Peak runs started with zero stacks and were usually around 250 by the time I got past the Assassins.