There's nothing wrong with DPing 3 times in less than 10 seconds, there's only something wrong with being predictable about how you DP. And it's all weighted by how much you get out of the DP and how much you get out of being punished for DP'ing. And when you have 2 charges, you get 2800 damage, and pressure, instead of being pressured. If you have 50 heat, it's not a waste of heat to spend it just to get pressure, assuming your DP is blocked. Tsubaki's DP of course has the problem that it isn't a guaranteed block, you can still IAD air throw etc it seems.