I think I'm pretty much done with the game.
Once I got my first max-stat dweller back from a 90+ hour (they stop picking up gear after they get 99 items, which is around the 90 hour mark since they get about 9 items from random events and get an item an hour) I found out that with that many items my phone can't render it well enough to quickly delete them.
So I transferred my save file to my emulated android on my PC and it runs buttery smooth. In the process of learning how to do that, I found out that my suspicions about the way endurance works was correct: You get something like 0.5 health per endurance when you level, and endurance only helps reduce rad sickness after that. A level 50 dweller that leveled with 1 endurance will have something like 200 health, a level 50 dweller that leveled with 15 endurance will have something like 560 health. So my 100+ dwellers I just finished leveling to max SPECIAL with varying degrees of levels were gimped in unknown ways.
So I recalled my exploring dwellers, gutted the worst of them, and started procreating like mad (With 21 training rooms!). I hope to make some 180 new dwellers. In the process I found I got no legendary items, which was surprising because I heard the 60 hour event, the National Guard Depot, has a 10% chance to generate a legendary.
I learned online this was nerfed and rarely or never gave out legendary items. I also learned that the chance to get a legendary each hour is ExplorationDurationMinutes / 360,000. I modeled that and found out that if a dweller explores for 90 hours the odds they get a legendary is about 0.5%. This means that if I send out roughly 170 dwellers to explore I have an 85% chance to get a legendary. With the round trip time being 90 hours (exploring) + 45 hours (return) = 135 hours, the average rate per legendary with 170 dwellers will be 158 or one week.
I can live with one legendary per week, but if you have 200 trips per legendary, that's 200*100 or 20,000 items per legendary. That means you not only have to manage the sending out of a dweller 200 times (I made a macro to click the mouse super fast 25 times for the stim packs so that's easy, PC gaming master race), but you also have to click on 20,000 items to delete them.
And this all assumes your dwellers will make it 90 hours, which is only going to be true for a small percent of them that have decent weapons.
FOShelter is just a small, fun game, but when I briefly examined FOShelter I hoped to make a baller vault and start farming legendary gear through whatever system they had. However I won't be able to accomplish my goal because I'm unwilling to cycle 200 dwellers per legendary and sell 20,000 items. I may pick it back up if they unnerf the NGD or legendary drop rates.
