I don’t want to beat a dead horse, but some of these things you can do on your own… you just need to add them manually. I’m not familiar with all of the options there but it looks like you want the least amount of configuration and want the things you particularly care for out-of-the-box. Aside from the videos, which will likely never be offered offline, you aren’t going to get that.
Also, Epic isn’t any more secure than Firefox is. Epic breathes the same line as Opera but at the end of the day, Firefox is just as safe if folk know how to use it. I can load identical preferences and install extensions to get the same things done. The only difference is that Epic comes with these things preconfigured, which in my mind, is annoying. Convenient, but not very libre.
The desktop icons issue, I believe, are rooted to Gnome—the desktop environment. You can enable the icons via a shell extension but I don’t know if they’ll work like they used to. What I’m receiving from your wish list there is that you want them by default. Again, that’s not likely to happen. If PureOS isn’t launching them by default, you ain’t getting them by default.
It’s one thing to demand things you want as defaults but it’s another to figure out how to get those defaults on your own. Aside from the how-to videos, which I think would benefit enterprise folk, I don’t see any reason to include any of the other things by default unless the PureOS folk think so. Again, most of those things you can probably add on your own. I’d imagine there’s a way to get that going upon deployment somehow (maybe script).