Mod Bod
I would ask if your PT convert ever learned how to use the Dynamic Transport, Loop recording, playlists, Pre Roll and Post Roll as well as a number of options in PT that SONAR misses. I'd also agree with Jeff about Studio One capabilities as well.
Punching in is a very important technique when you need to get something finished as quick as possible.
You would be asking a question that isn't relevant. I didn't say he switched because he didn't know how to comp with Pro Tools (in fact I didn't specify why he switched). He used punching a lot because, as you say, "punching in is a very important technique when you need to get something finished as quick as possible." He still punches all the time in Sonar. It's what works for him, and thanks to working with him, I've re-discovered the benefits of punching.
Nor did he switch from Pro Tools to Sonar. He switched to a different DAW first, due to his frustration with both the Mac and with Pro Tools. He stuck with Windows, but didn't like the first DAW he tried. I suggested he try Sonar and he didn't take me seriously. But when he started using it, it did exactly what he needed it to do, didn't crash (which the previous DAW he tried did regularly), and he found recording faster and more enjoyable. He switched for
many reasons, both to Windows and eventually, to Sonar.