I agree 100%. While I wouldn't go so far as turning off all of the DDoS settings and managed rulesets (why pay for it then?), you can certainly set the "secure/strict" level to medium or low and still retain benefits.
I'm wondering if it's related to Cloudflare's new/updated Bots features, especially the "Super Bot Fight Mode" feature -- which I believe gets a default setting that is super strict.
As others have mentioned, saner defaults might help, but I guess they want to error on the side of "more secure" vs a less secure default.