I’m going to close this thread to stop all of the +1 replies. The Let’s Encrypt project is aware that people would like us to support wildcard certificates and that some people have use cases that can’t be satisfied without them.
I believe the technical discussion related to how this would work if any ACME CA decided to try to support it is mostly in the ACME WG at the IETF, so people are welcome to talk about the technical questions there. https://datatracker.ietf.org/wg/acme/documents/ (Note that the ACME WG doesn’t decide issuance policy for Let’s Encrypt; what could be on-topic for them is a discussion of how wildcard-related verifications could happen at a technical level.)
If anyone has a different issuance policy question, or a question or suggestion about workarounds for people who can’t get wildcard certificates, please start a new thread to discuss it. Starting a new thread in the future is also appropriate if Let’s Encrypt makes any future announcement about this topic.