Let’s Encrypt is not dangerous and we did not make the deliberate decision to block or restrict Let’s Encrypt. It’s just that Let’s Encrypt doesn’t play well with the security systems we had in place before Let’s Encrypt ever became a thing. I repeat: this security system was not put in place to block Let’s Encrypt.
If we believed it was dangerous, why would we advertise in on premium hosting? The only reason it does work on premium hosting because premium hosting providers are willing to take more risks for their customers because the money they pay makes that possible.