Not comparing to Cloud Armor, but the $200/month minimum to bring one's own tls certificate. That alone puts Cloudflare squarely on the list of unusable options for any small project or business that is running their entire production infrastructure on less than $100/month. Also, the inability to specify cache expirations below... what was it... 30 minutes or 2 hours? Again, forced to pay too much for one of the core features of a CDN.
Hmm. Cloudflare provides free TLS certificates automatically. The feature you're describing is for if you want to upload your own certificate and private key to Cloudflare for it to use on the edge. Do a lot of small projects really need that?