What Is the Primary Argument for Enabling Full RBF by Default in Node Software?

The primary argument for enabling Full RBF by default is that it enforces economic reality and improves fee market efficiency. Proponents argue that 0-conf transactions were never truly secure, and Full RBF forces users and merchants to acknowledge this by waiting for confirmations or adopting Layer 2 solutions.

By allowing any transaction to be replaced by a higher-fee version, it ensures miners always select the most profitable transactions, leading to a more competitive and responsive fee market.