Thanks! In retrospect, that doesn’t seem like a big deal. I guess I’m effectively paying $1/year for the option of being able to change authoritative name servers to whatever I want (and the privilege of using Porkbun’s presumably worse interface).
I’ll admit I was already a little biased against Cloudflare because one time I got caught by their infinite captcha (maybe due to my OS not being up to date because it was an old computer? I’ll never know…).
I have yet to see a DNS zone manager as good as CloudFlare, so I've been using it anyway for the past 10 years for all of my domains.