Item two is convenience. All these systems are "faster wire transfers". I don't really see the point of them when you can already do instant IBAN or even phone number based transfers.
What they do not have is a line of credit backing them. Got to make sure you have money in "the particular system your merchant accepts". Also at least in eastern europe credit cards come with the possibility to pay in a few installments with zero interest (paid for by the merchant of course, so not everyone does that). This is gone in the new system.
What they also do not have is the fraud protection of a credit card. You may be able to revert a transaction but the money is gone from your account and it will take a long time to see it back.
On the other hand it's harder to spend money you do not have so perhaps the EU is trying to make its citizens more financially responsible? :)