We’ve already had mobile MaidSafe apps without using an App store. There are also new App stores which bypass Google Play.
This is a relatively unusual route at this point, but it is growing just as recognition of other issues which Safe addresses is causing people to want alternatives to surveillance platforms and apps.
To ignore mobile would be a big mistake, since it is a massive market and in many regions the only way people access online services.
Docker is a PITA and IME a poor way of deploying to Linux, or cross platform. It also relies on a vulnerable centralised service to deploy its containers, so has some of the same issues as App stores.
I think you overestimate the difficulty of supporting multiple platforms, desktop and mobile, and underestimate the importance of doing so.
Every time you cut a group of users loose, you reduce the opportunities for network effects and reduce the value of the product to every user, because we are all part of networks which include users of different platforms. The reason the web got so big and so useful so fast, overtaking desktop software which had dominated for decades, is because it was universal.
Safe is for everyone.