they eliminated 0 conf transactions in their idea of scalability so every vendor will have to reprogram everything to do reasonably quick will have to reprogram everything to work with new more complex interface.
You mean opt-in RBF? "Classic" will have this too, right?
0 conf rules ..da fuq
Don't worry. If you like your 0 conf, you can keep your 0 conf.*
*Disclaimer: 0 conf was never secure in the first place.Security isn't an is/isn't dichotomy.
Zeroconf on a $5 coffee might fit your risk model, an interbank transfer of $3m then one, two or even 6 confirmations may not be enough.
Accepting Zeroconf is a choice. RBF takes away that choice.