I run O27 switches and track. When my layout expanded in January, I started buying the larger #O22 switches. I have mostly postwar and MPC rolling stock. My lovely bride bought me a LC+ Mikado for Christmas. It is a 2-8-2 with modern electronics. It handles the tight curves and switches just fine. That said, all future additions will be O31 for me. With suitable effort, they will all live happily together.
Bill