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Surely there are performance costs associated with this.
Not that it would be significant for most applications, but just sayin'

I guess you could figure out that it must solve the problem that certbot solves, without the trouble of configuring or running nginx. But a huge gain, but it does enable a single executable web server, which seems pretty convenient to me.

But that doesn't mean you ought to use it.

Yes indeed. It's just that we already have certbot and it works fine. So no problem was present.

A single executable does seem attractive.