Another great depression would definitely happen because hardly anyone uses cash or coins for purchases. You could try to get your money out in cash from the banks...but good luck proving what you had in the bank because I doubt they have as good a paper trail as you'd want them to. Last statements would be reflected on probably, and as I think while typing, I would hope my last statement they'd have to reference would be the one before all of my bills came out for the month...because it'd be more money, haha.
Overall, the lack of instant information would be a major issue. I have always contended that world war three has just been this ongoing thing since the 80's. We called it the cold war and then kind of acted like it ended, but it really just got way, way more intense. The cold war was absolutely about / over information (codes, passwords, military stats for every country, nukes, energy resources, etc.) - and well, what do they call the age we live in..? The information age. So, yeah, I really think that it being something the entire world takes part in and competes, then the cold war never ended...it got bigger...it got worse.
I mentioned this before somewhere, but I grew up not having all of this tech and internet and just constant bombardment of knowing everything, from everywhere and at every single second...and the feeling of being gaslit to worry and care about countless things that I can't even do anything about. I contend that we were actually way better off in that regard. I mean this in a very Einstein way of "what's actually relevant" to each person, but I do also mean it in a way that just minding our own business in localized amounts is better for people. I don't want people to become tribal in regression and then it cause issues, but I think it's debatable that the internet does that, too...and it's worse being on such a grand scale.
Sorry, I rambled. Interesting topic that I have obviously thought about before.