I've done it all in cash in the past. It's not "hard". It's only thought of as inconvenient because we've been raised to think so. Now, some of those things are no longer easy due to incumbent "automation" [automatic deposit, for example]. I have had cash jobs in the past. It's not a "game changer" It removes friction, yes, but it's not in the same league as curing disease, bringing about equality or reducing pollution, etc. --the big things that matter in improving life.
There are many, many apps out there to facilitate many things, to reduce friction. You know the two that matter most to me [other than telephony]? Navigation (maps) and Yelp (or similar) [finding food, entertainment]. Most other things can wait till I get to the office or get back home. I detest the idea of being electronically "tethered" into always on attention.
No, the convenience is real and doing those things manually consumes time. Heck, I have a small cheque sitting on my desk for weeks because it's not quite worth enough to take half an hour out of my day to take it to the bank.
You should look into a bank that has a good App. I use BECU and they have feature on their app where I can deposit the check with a couple snaps of my camera.
Fine. Prove it. Collect your pay in cash. Pay your rent in cash. Do all your shopping with cash.
Otherwise, lay off the fairy stories and moralising.