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Yes, however it defeats one of the main point of ECH, that is encrypting the SNI. Since the domain is leaked in plaintext DNS.

Why? You can just use DNS-over-TLS/HTTPS + dnssec + ECH + TLSv1.3 and then you should have a unblockable website(outside of IP address bans).

Ah yes, sorry I thought you meant can't we just use plaintext DNS + DNSSEC.