Right room wrong room, what is the rule?
Collections taking too much time, such as 2020 items. Consider having one item per hour per dwellers, it takes 2020 explorer hour. = 84 explorer days. With 25 explorers, it will take 3.36 days exploring. Plus return come up to 5 days. Too much for a single objective.
Rad away never needed in the collection.
Raising special only count each dwellers once, this made it impossible in the late game. I have noticed dancing and pregnant not appear in late game. The same should apply for special.
Also Suggest let player skip more than one per day, by allow buying "skip cards" with caps.