I get where you're coming from but I depend on a subdomain for each one of my user signups and we're talking thousands. LE limits us to 100 subdomains on a single cert and would require a restart for each signup. I'll definitely be using LE for other projects but many use cases require wildcards.

And most of those wildcard use cases are business sites/applications that can/should just buy a wildcard cert. That said, I wouldn't mind seeing better support for the freedns/dyndns subdomains.

Some people are using dynamic dns records, so the list of subdomains is not static. This is where wildcard ssl is perfect. And what if you have hundreds or thousands of subdomains? It unnecessarily bulks up your configuration as you have to do a cert per site instead of a single one.