It would be nice when you request donations, you are allowed a filter for what you don't want donated.
For example, if you have a level 8 TH, you may not want 5 Level 1 Wall Breakers taking up 10 spaces. To have to clear them out, then get to request 15 minutes later, is a big annoyance. Especially when someone is requesting something specific.
So, maybe you want Archers, but only Level 3 or higher. Or you do want Wall Breakers, but only Level 5, and no more than 2 of them.
If you want more details of the type of Donation Request Filter, I can fill in with more details.