It depends what your goal is.

Having to use a browser to crawl your site will slow down naive crawlers at scale.

But it wouldn't do much against individuals typing "what is a kumquat" into their local LLM tool that issues 20 requests to answer the question. They're not really going to care nor notice if the tool had to use a playwright instance instead of curl.

Yet it's that use-case that is responsible for ~all of my AI bot traffic according to Cloudflare which is 30x the traffic of direct human users. In my case, being a forum, it made more sense to just block the traffic.