Being able to have train/bus passes on my phone whenever I go to another country is nice. Some places are a pain in the ass because even different cities have their own systems and they're all given names like IBCJ or JGCUVFGIB as if anyone is supposed to figure how to look them up. And oftentimes physical passes can only be bought from machines in select areas. And when going to undeveloped areas (particularly Europe), the few machines that do exist are broken and look like they were abandoned years ago, leaving the only option to track down where some rail staff are and trying to find someone who won't just wave you away without even looking at your face and hoping they'll help get you a pass instead of needing to get annoying one time tickets. Then sometimes places just tell you to install an app to buy tickets. That app requires a local phone number and address to verify.

Apple wallet lets me install passes and charge them up without even being in the country that I'll be visiting yet. It makes things massively more tedious. I wish more European countries supported it, because as much as Europeans have some weird pride in their public transportation, they're more complicated and backwards than even the poorest Asian nations. Being able to add any pass to Apple wallet would be a huge step in resolving that.