It is likely that every kind of encryption scheme we use can be broken in future (including RSA). However, at the moment, we don't have any quantum computers that can break Curve25519 or other strong ECC-based ciphers. Before this changes, GPG (and other tools) has to provide new post-quantum crypto. Then, we also have to change recommendations.
Besides, this is also true for TLS. Breaking the key exchange (e.g., ECDHE) likely breaks forward security.
I disagree with you. ECC-based ciphers and RSA are not at the same level against quantum computer.
From the read I did, the key length matter and a 4096 RSA bits key required a stronger quantum computer than a 256-512 ECC bits key.
That is why I think RSA with a key of 4096 bits is more future proof than ECC 256 bits for GPG.
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