Gambit isn't really about activity though, because it's about spamming tons of stamina rather than focus. That also means that you do indeed benefit massively from having more stamina, since the more stamina you get from one consumable the higher the odds are you get another shake/peronamin with the stamina you just got back. Also, I know from your past posts that you're not a big fan of camping caches, which is pretty important during the gambit to get more consumables. If you want to get ahead in the gambit through activity, camping caches is pretty much the way to go.

I'm also not sure why you wouldn't use peronamins during the gambit. When else are you going to use them? Only Gambit really requires you to use peronamins and imo you shouldn't use consumables outside of events.

Well, probably you are right. I just don't like to use consumables, since they are "paid items" in general, and if i'll get used to using them i will run out of them one day when i'll need them - and that day will come pretty fast, i guess... So i mostly (of not "only) using them to adjust my EXP level to get the maximum profit from level-ups (like, using a half-peronamin to roll some more Exploring or GHQ to complete the third daily mission streak to get an SR WC or R Gacha Ticket and get another level-up and burn STA &/or Focus it gives before going to sleep, instead of going to sleep with like 6000/6200 Exp to wake up with full 400 STA, use 200 of it and get a level-up, just discardinmg like 200 STA or something like that, or going to bed with 7/10 Exp and 8/10 Pero Daily streaks. Or i'm using the consumables like Pero Puddings during EG events, when i need to poke alot of SEGs to get tons of loot and 200 SEG eliminations. Other than that i try to use only Temporary COnsumables, to play through Events "pure f2p" and see the results, saving Peronamin and Puddings "for the hard times". But i guess, Gambits are those "hard times", and seeing how much loot, including SR WCs and even R Gacha Tickets i get during the Events, i'm starting to think that Daily Missions are not worth trying to complete, since their completion takes too much time from me and sometimes - consumables, too - and i can always compensate those rewards by loot during Events.
As for the case camping - in the first place, if you read my previous posts, you should know why i dislike such behaviour and that i consider it unfair to other players to do that. The second thing about it - is just the fact that i'm not a machine, to spend hours by just clicking 2 buttons - and i don't want to even keep the game running in background all the time, lowering FPS in the other games that i play, that don't run smooth enough even without other heavy stuff like Flash games in the background and alt-tab to it every few minutes, or wait for it to load every time (and PPS still disconnects and requires to be reloaded every 30 minutes, so it doesn't make sense to keep it running in the background if you don't visit it more that once in half an hour or even less frequently, anyway). If i had and Android device to run PPS on it, or could make some command-line macro to open those cases for me - that's another thing, but manually - no, it's not my kind of behaviour. TBH - i consider it a bad idea in general. IMO, the cases should not be shared / timed / hunted / stolen to not make such problems. I'd rather prefer if i could just accumulate cases from my friends during the day and open them all at once when i enter the game, say, 3-4 times a day.