> four 2048 bit RSA-SHA-2 signatures in 1049 bytes which is well within the EDNS MTU for unfragmented UDP

I was referring to the non-EDNS 512-byte limit.

Yes, you get ~2.5 times more with EDNS. Still, four records is not a lot.

> DNS needs TCP even in the absence of DNSSEC, because there are queries you cannot resolve without it.

Theoretically? Perhaps. Some would argue that connectionless DNS is valuable enough that people should not create those resource records. Before DNSSEC that was a working consensus. And with ECC it could be once again.