For the same reason that we need cash, we need to keep paper tickets at least as an option. I'm surprised the sentiment in this thread is so strongly in favor of cards; normally HN is a bit more cash-friendly.
Neither has a credit/debit-card based viable solution at present that'd be tolerable.
For what its worth, you can use Leap for Bus Eireann and other services[1].
I think Irish Rail (excluding the Free Travel Scheme[2]) is the hold-out, in rural areas, as Bus Eireann and Irish Rail are the only services available in those areas.
While not the contactless payment scheme inferred from the article, it would still be a viable alternative to paper tickets.
[1] - https://www.transportforireland.ie/fares/leap-card/
[2] - https://www.gov.ie/en/service/9bba61-free-travel-scheme/
Edit: formatting
[1]: https://www.ns.nl/binaries/_ht_1583338071691/content/assets/...
[2]: https://mastodon.social/@rubenivangaalen/109705862906000821
This ought to be incredibly rare, but if you actually do literally run out of battery (not just it gets to the last few percent) then this technology doesn't work, whereas your bank cards do.
While I believe you're correct for the iPhone, that it won't work, it's actually not as impossible as you suggest. The NFC-capable BlackBerrys that supported the very early tap-to-pay with a phone had the concept of a default card, which could be programmed onto the secure element and would work even if the phone was totally dead (even if the battery was removed). The NFC field was enough power to boot up the secure element, just like it's enough power to run the chip in your bank card when you tap it.
Later phones dropped this support, as it took a bunch of engineering effort and customers largely didn't care. But if customers ever start demanding it, so they can totally stop carrying a bank/credit card, it is possible.
So you'd have to message this very carefully, on top of the engineering effort, and my guess is that in reality "Reserve power" is always enough. If your phone "died" (screen turned off for lack of power) at the party, you have several hours after that when it can still do enough NFC to get on the bus home.
A lot of my friends get anxious at like 10%. Sure, at that point you should probably stop playing Candy Crush, but you're a long way from not being able to tap in to your train home if you stop. Power Reserve seems like a sensible choice to make you stop using the last dregs for frivolities.
https://support.apple.com/en-is/guide/iphone/iph0475909d4/io....