That will allow him to try out apps (which I'm sure he does on the founders' devices or on YC-owned devices), but it won't make him think like someone with a sm

That will allow him to try out apps (which I'm sure he does on the founders' devices or on YC-owned devices), but it won't make him think like someone with a smartphone. It won't help him think up RFSes with mobile apps at their core, and it won't allow him to say "wow, that app you're pitching to me would remove the annoying 3-step process that I do whenever I do X on my phone." The importance of him truly thinking like someone with a smartphone will grow over the next few years