Meet "the Venmo line":

http://qz.com/277509/read-what-happens-when-a-bunch-of-over-...

Your kid's school doesn't take Venmo for field trips. Or school lunch programs. Or extracurricular activities. That's just to name a few "adult" things Venmo doesn't support, and requires a checkbook.

Great, you can pay friends back for rent, drinks, or eating out. #millenialproblems

It seems more like #twentysomethingproblems, not #millenialproblems. As a GenXer this was stuff I dealt with far more in college and just after than I do these days. I imagine it was similar for my Boomer parents.

I think that's my point. Once you get older, this problem drops away. You probably don't have roommates (no need to split rent or utilities) and you probably eat out less often (and when you do, you can split the check).

If you're a parent, you're paying for things that require a check or cash. The check then become's "frictionless" as you already require it.

This is true. And I had a longer, but more rambling reply, saying that.

I can still see situations where I'd prefer this (or similar) to cash. For covers at bars ("oops, forgot to hit the ATM! Can you get me?"), for buying tickets to shows (to ensure we're seated near each other), and other situations. But they're still infrequent compared to a decade ago for me.