It's already blurry; humans are already used to using chunks of the environment as parts of their state of mind. I have personal experience with this: as I've been dragged from my previous highly-customized Linux desktop into a more software-conformity-centric world, it's had pretty distinctly constraining effects on the way I'm able to use my mind, making various forms of easy external fluidity close to impossible. I've tried to fight against it, but the environment evolves so that people expect you to have the executive function of all their devices combined, and the only way that you're allowed to is by having either the same or similar devices or orders of magnitude more resources.
Toddlers are, today, growing up with iPads, YouTube, and Alexa/Siri as just a natural part of the world. As far as I've observed—admittedly not much—educators and parents are far behind, I would speculate both because grasping the indirection-of-agency that this sort of technology creates is a heavy abstract task of the kind that doesn't seem to filter through those parts of civilization well and because the technology has the ability to change too quickly to counter any attempts to pin it down. And pinning it down in too static a fashion could have its own horrible effects.
“FOSS” in the original sense is largely a distraction here (even though it is still an important idea), given that we've wound up in the “programming is specialized” world. The dynamic characteristics involve how agency flows through systems, and in the presence of highly distributed and often SaaSS (Service as a Software Substitute, as the FSF describes it) systems, being able to alter the source code isn't a solid defense even at “skilled programmer” speeds: going against a rushing current just means you get torn apart as soon as you touch the world. I think we need a new word for what you probably meant but which I don't know how to articulate well.