Alliance and/or sponsor section: I think it would be cool to not only list corporate sponsors, but also a head count of private donors. Would underline the message that this is a system by the community for the community. Maybe even give a shout out to developers and translators in the same section, illustrating clearly the various ways to help.
Installer page: The labelling of this page is a bit problematic to me. I think "Get Ubuntu Touch" is a better headline, as it more clearly communicates its purpose. This also gives a clear hint what the page is missing: I don't think it should be an except copy of the "Devices" page (which I adore): rather, I think it should be a presentation of a few particularly well supported and popular/available devices.
This could be combined with a (interactive?) search bar (or something similar) for the hardware listed on the "Devices" page - "Check if your device is supported".
On a page like this I would envision that devices available to buy would also be presented. Right now I guess only the Pinephone is very relevant, hopefully the Vollaphone, Librem 5 and maybe even the Fairphone 3 will join the ranks soon-ish.
A user of ubports.com would learn what UT is, click "get UT" if interested, and then be presented with alternatives for buying or installing. Seems as intuitive as it gets to me.
OS page: Another idea: How about instead of asking "why" or "how", we ask "who". I absolutely agree that UT is not only for developers - I personally am a social scientist and know no other programming language than R. I do not at all plan to use my phone for coding. I just care about what products I use, and seek to avoid Android in the same way I seek to avoid H&M or chain restaurants.
By listing the types of users who would benefit from UT (possible examples include the privacy minded, the student (portable desktop?), the programmer, the idealist, the researcher) we could showcase the different features of the operative system in a way people could hopefully relate to. I imagine basically one feature and illustration per user type, where possible overlap is of course a good thing. I think we should make an effort to be honest here, and rather expand the list over time. Being good is not enough - we need to find reasons why UT is better.