I mean, it hasn't been anywhere near feasible for years.
At the moment something like 40% of hash power is mining with full-RBF enabled. Looks like Braiins pool is the latest to enable it: https://twitter.com/peterktodd/status/1748845926607638555
reply
In 0-conf you have a trust in other party. Full-RBF doesn't change that. And full-RBF has always been possible from miners perspective.
reply