Virtually every BLD method used by anyone for non-speed-BLD is sub-2able with tons of practice. 3OP, M2, Classic Pochmann, TuRBo, BH, (insert less well-known method which I left out of this small list here), or any combination of them can certainly result in sub-2 solves. The question comes down to the balance of time spent learning vs time spent practicing vs time spent solving. A small bit of time could be put into learning Classic Pochmann and a huge amount of time into practicing it, still achieving sub-2, but spending more time to learn a more advanced method to begin with could yield more or faster improvements.