I disagree that bot resistance is important to anyone, or even a reasonable goal for anyone at all. Bots are just users
Bots are users, but they aren't human users. I think it's fair to say that most web sites/apps value human users over bots (maybe that's wrong though?). But I think an argument can definitely be made the bot resistance is valuable/important to most people on the web.
Maybe I'm just a different generation than the folks writing these blog posts, but I really don't understand the fixation on such low resource usage.
It's like watching a grandparent freak out over not turning off an LED light or seeing them drive 15 miles to save 5c/gallon on gas.
20 requests per second is just... Nothing.
Even if you're dynamically generating them all (and seriously... Why? Time would have been so much better spent fixing that with some caching than this effort) it's just not much demand.
I get the "fuck the bots" style posts are popular in the Zeitgeist at the moment, but this is hardly novel.
There are a lot more productive ways to handle this that waste a lot less of your time.