Personally, I don't do it, but I understand why it's appealing. I see it as a personal decision (its your website after all) and not morally wrong as some see it.

I once talked to someone working security for a Canadian government agency. They considered it against their charter and/or illegal to block tor nodes, because it could be blocking legitimate access for Canadian citizens potentially in distress, much to the chagrin of their downstream customers (other agencies). I thought that was pretty interesting.

Hopefully the Tor devs consider the proposed enhancements to make the traffic less vulnerable to identification. As he already digged into the source code, maybe it's easier when he submits a PR for a higher chance to fix the issue.