I know I can go to a special equipment purchase screen through a hero and that is really cool. This suggestion is for when you are in the general equipment purchase screen.
when I tap on an item to see it, it would be nice if to the left is showed a list of my heroes that could use that type of equipment. Grey out the people who couldn’t use it right now (too low level or whatever). Then show a green up arrow next to each name if it would be an improvement or a red down arrow if it would be worse and a grey equal sign if it is the same or equivalent.
In the treasure trove, if you have multiple keys and one opens a chest, you have to close and re-open the treasure trove to use the rest of your keys. I should be able to just tap the reward and it take be back to using the rest of my keys.
work around for now is use all keys before tapping chests if one gets unlocked- but this would still be an issue of more than 1 chest was unlocked.