Just being able to do it via mail sounds like luxury, to renew a Swedish passport you need to visit an embassy in person. And then in 2 weeks go back in person to pick it up. Really fun when the embassy is on the other side of the country and it means expensive plane trips. This was even more of a problem during COVID when borders were closed, since Sweden doesn't have embassies in every single country.

And they expire in 5 years, not 10 like many other countries.