Because he's seen a ton of resumes that say Flutter experience, and when he digs in he sees that people have written a Hello World or tinkered with a few exampl

Because he's seen a ton of resumes that say Flutter experience, and when he digs in he sees that people have written a Hello World or tinkered with a few example pieces of code in a senior class project. Or they watched a Google I/O presentation on YouTube. Asking how many years you've actually spent with a framework is a valid question, and you're going to get it again. So look inward. Do you really have 6 years of actual experience shipping apps with it? Or is it 2 or 3? Maybe one? Have you shipped at all? And if you have shipped a Flutter app, pivot the conversation to that instead. Point out what you did. And then it doesn't matter how many years you did (or didn't) spend on it because you're giving the the interviewer what he is looking for. What's that Spolsky tag line? Smart and Gets Things Done(tm)