I rarely get any important physical mail these days. But I still run into issues over address problems (ironically, more now that I am back in housing than I ever did while homeless: https://writepay.blogspot.com/2019/02/mailing-address-drama....).
My life is mostly online. I was a military wife for a lot of years and moved around a lot. Lots of people have very physically mobile lives these days.
Yet, we haven't adapted our systems to this reality. We want to tie everyone to a physical address for a long list of things, as if we are plants who can't move from this one location or something.
I don't know what the answer is, but, wow, I sure wish we would come up with better answers than acting like this is still the 1950s and everyone will work for the same company and live in the same house for decades and we can each be found in some particular location all the time.
Just register with an email, things are autoscanned and sent to you with a PGP key you provide.
What you will get is a web application you get to sign into to actually get your mail, and you will receive a notification mail in your regular email inbox stating that you have received mail (but not from whom, or what the subject is, because that is privacy sensitive information), so that you know that you should go and get it yourself via the web application.
This is what every digital 'inbox' that isn't email has done thus far. This is in fact exactly what the Dutch government has done with their digital inbox which is intended to replace physical letters from services like the revenue service and municipalities. Thankfully that monstrosity is optional (for now).
But maybe I should get one again at some point. Maybe that would help with some of mail/address issues.