By now I assume most people don't have much in the way of 3* on their team. I'm entirely 4* and higher, and am sitting on ~7k blueprints waiting for 5* I like to be available for research.
(that said, I'm thinking of replacing the 2 LT in my lineup with either MT or HT. I don't see much point in LT, they seem to just run up front then immediately die, even if I slap as much evade on them as I can.)