If you don't want your travel to be associated with your bank account, you can get a chip card which can be topped up using cash.
Germany had it for a while (TouchPoint) but they gave it up thankfully — although I don't know the exact reason it was given up.
I bought a 24h pass at 8pm, only to find out it's 24h only if you buy it at 00.00, because they all expire at midnight.
They are basically running a legalised tourist scam over there. I can imagine hundreds of thousands of people falling for this.
(They expire at 4am, though the point remains.)
I think only foreign tourists who don't have a credit/debit card, or whose banks levy a high, fixed charge per card transaction, or who are eligible for some other discount (foreign children age 5-17) should buy an Oyster card.
1. The weekly capping always runs Monday to Sunday, so if your stay doesn't align with that, you'll get to pay an additional capping period, in which case buying a weekly travelcard aligned with your stay will likely be cheaper (as long as you know which zones you'll mainly require).
2. Having a travelcard gives you the ability to buy slightly cheaper rail tickets for destinations outside of the TfL zones. Pay-as-you-go doesn't, unless you physically get off the train in order to touch in/out at the boundary.
3. Transit nerds only: Pay-as-you-go is subject to certain maximum journey times. If you'll exceed those by staying to long within the system, you'll be presumed to have forgotten to touch out and will be charged a maximum fare. A travelcard avoids that issue.
This is extra true if you're traveling with a family including kids, as I often am.
Last time I was in Copenhagen I asked at the hotel desk how to get to the airport on public transit and the guy said just take a taxi it will be faster and much easier for you.
I agree that tourists in an unfamiliar city will often just take a taxi by default though.
I’m also surprised airports don’t integrate it into their passenger fees and boarding passes. But maybe that’s getting a little too multi-modal to handle.