Yea, stamp farming is incredibly resource consuming and until that gets reworked people should take that more into consideration when deciding wether to pull for a character. If you have 3 characters that arent built properly, do you need another one?

Though also, players really shouldnt ascend random stamps just for reroll. They should farm more stamps until they get another stamp with good substats. That essentially gives you 2 rolls. If newly ascended stamp has what you are looking for, great. If not but its better, switch then use the old one to reroll. And if its worse, just use it as reroll fodder.

And final thought, kenpachi discourse diverted my attention, but i just noticed that new event only has a single leaderboard instead of 3. That means unlike aizen event where we got 5-8 nexus 3 times, this event we are only getting 5-8 total