You could just, like, ask me! Talk to me like a human being. You'll quickly see I'm all the things I claim to be on my resume. /s
Eg: "Tell me what happens when you type an address into your browser bar"
Someone junior might say "You type in the address, it fetches HTML from their server, and your browser shows it" -- "go deeper" -- "Their server uses HTTP or something.." etc..
Someone senior might get to something like "Well when you press the first 'w' key it triggers a hardware interrupt ..." or more likely something about TCP/IP and the rest of the network stack...
you get a very interesting range of answers
A doctor can do a whole lot more damage than the vast majority of software engineers, and yet doctors don't have to start this proving process from the ground up every job change.
I can understand the arguments for many of those, but... uh... somehow you're going to need to prove yourself. We can't just throw everyone who shows up into the position to see how they'd do... and the HN gestalt would presumably complain about how awful that is, too.