I agree with others here. Wildcard entries are super important. I'm here because Google Domains. If Squarespace is really happy about inheriting all of these domains, I do sincerely suggest they enhance the functionality of their product. I have nothing against Squarespace, but I too will need to transfer my domain at some point if they can't manage to offer this functionality. Sure, I'm just one customer here...but I don't think I'm alone in this scenario.
Oh and does their help/documentation pages just do an infinite redirect/reload for anyone else either? I can't even read their support resources/knowledge base.