It is supposed to lower the bounce rate for AMP page visitors (according to themselves at https://www.cloudflare.com/website-optimization/amp-real-url/)Haven't tried Cloudflare's AMP Real Url yet though
Which kinda makes sense if the url-bar shows the real url of the site you land on, instead of the "mini fake addressbar" that shows if you don't have it enabled
- The AMP addon I'm building actually suggests about this if the site is served through CF, but the option isn't enabled
I think the main problem here is that XF loads quite a bit of assets, that need to be manually stripped away according to your own forums' need..just retested those urls and I can see clearly that you have a lot of room for improving non-AMP style - just optimising that could have you close to your AMP results to start with
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And most people don't really have the know-how for what can be removed safely, and how it can be optimized.
I do it for my own sites, but then again I'm a full-stack developer also, and have quite a bit of experience doing SEO optimizations