Do you work on an island?
So what you are saying, is that, given that, unless I went home and coded and contributed to an open source project during my free time, I am a shitty engineer, not worth your time. Get real. Incidentally I work elsewhere now. They asked me to solve a programming task before an on site interview, and then...shock, I had an onsite interview process.
Do you think that when a heart surgeon from NYC applies to work in Seattle or LA, they say, "That's great that you didn't kill anyone at First General on 57th street, but, do you have any published video of you doing surgery pro bono we can watch so that we know you're not full of it?"
I think their diploma and med license are sufficient. I also think a lot in hiring decision for particular surgeon can depend on their peers opinion.