I have installed a couple of different Linux OS on desktops and laptops and I have installed Touch on several Nexus 5s for me and some family members, so I am no greenhorn. I am, however, no expert either and learning the cell phone side of things has been fun but tedious.
My point is, this site is written and maintained by Ubuntu Touch geeks, and I say that with all the love in my heart, but you have to learn to write and speak to people who just want a phone but are tired of the add tracking and looking for some anonymity.
For example, in your documentation, there is no discussion on sims cards or carriers. There should be more information on what carriers work as well as the potential impact of VoLTE on the older phones.
Your user docs... I am not sure who the audience is there, but for someone totally new to Ubuntu and not technically savy, I would close the tab and go back to my Android phone. You don't even mention how to navigate or discuss any of the settings. Under "Daily Use" you talk about creating a container. The very first sentance under RUN DESKTOP APPS is "Libertine allow you to use standard desktop apps..." Great! What the heck fire is Libertine? Then you go on to say you can manage installation of the desktop apps through settings.... but what happened to Libertine? I thought that was going to be used for standard desktop apps? Then you jump into creating containers. Why do I have to create a container and what is a container?
I know... this OS has to be installed on an older phone so technically savy people have to be the ones installing this, and yes, I was able to figure out Libertine and play around with that, but average people want a phone that works. More and more of these average people are beginning to understand privacy and want out of the tracking madness. Your UBPorts software is great! I learned to install Touch on a Nexus 5 within a few minutes. People who come here need to know it's easy to do.
If you want more people to be using Ubuntu Touch then you have to make it more accessible for average people. If you are just looking for developers and phone manufacturers, then you need to spell that out. Figure out who your target audience is and talk to them. And stop with the geek speak. All it does is scare people away.