Excuse me, I am currently in Germany.
So could you please resend your post to me via Telefax?

To an extent, institutional inertia. If it ain’t broke, don’t fix it.

Adopting new systems brings in a layer of uncertainty, sure maybe there is some upside to the new system, but does it outweigh the risk and cost of overhauling all the dependencies of the old system? Can you be sure that all the relevant stakeholders and partners will be onboard with the new system, or will some reject it and insist on the old system, thus requiring everyone to maintain two standards.

It’s much easier to adopt a new system when the old system is clearly non-functional and untrustworthy, or when there just wasn’t an earlier system that did that function in a given economic environment. The more important the institution, the more issue it causes if it fails, the more this applies.

It is often simply a legal thing. In many countries, laws have clauses for the legality of written notification, but no amendments or specification about how this works for a digital notification.

What happens if your bank is hacked and it says that you have $1 instead of 10k in the bank? Do you have a paper backup at all? How about your mortgage or car loan?

A few answers:

Sounds like you have a shitty bank.

Traditional mail is important in the US because not everyone has access to the technology you speak of. Keep in mind, the USA is 50 countries in a trenchcoat and many areas / states are 3rd world.

Institutions like to use the previous point to justify not updating systems or keeping systems intentionally frustrating in the hopes people will not bother them.

Snail mail, even better certified mail, is a de facto standard that can reach everyone everywhere. Also, it make sense that the most widespread and solid communication channel is still considered the official one

Here in Italy you can also use certified email instead of snail mail, but you need to purchase and pay (yearly) for an account. So snail mail still ubiquitous and solid. Certified email better, faster, if you can afford it (pretty cheap, but require an active action from you, to get it).

Building a secure, reliable, accessible and privacy respecting identity management infrastructure would be a monumental task, even if only good-faith actors were involved. Unfortunately, good-faith actors are in very short supply these days. In places like China or Singapore, people have no expectation of privacy to begin with, so it's easier to build digital services there.

You have a shitty bank 🤷‍♂️ I haven't mailed docs ever in my adult life. Seriously I have no idea why you're mailing shit.

While I fully agree thing should be digital (mail or fax are you kidding me?), very few business have secure email set up, especially for PII and health data. And even if they did, most consumers don't want to deal with setting up encrypted email/PGP keys or anything like that.
Of course this could be solved with online portals to submit PDFs and things.

I am in Poland. We have digital ID and drivers licences that are on par with plastic ones, digital patients portal where we get our prescriptions with QR code, we register and make changes to our business online etc. I never got mail from the bank but from time to time I get paper mail from various institutions - extreamly stupid situation last week - I wrote to the ministry online, via government portal and got answer via traditional mail 🤦‍♂️

It depends on the bank. All my banks want everything to be digital and pushes everything to be handled online. This includes signing.

I'd question what bank you have.