Ashley
I believe this is distinctly different. Fedora Silverblue allows you to install packages through rpm-ostree. The idea Adrian presents is that this overlay system is a band-aid for issues in an immutable operating system.
There are several other differences discussed, but it’s also worth mentioning that because solution A exists, doesn’t mean there can’t or shouldn’t be a solution B.
As an admin who manages windows devices, it’s not only a pain for the end users. I will readily admit that the management tools are quite extensive and somewhat easy to use, but they’re damn near impossible to debug when they don’t work, and that’s quite often. Gpo’s often refuse to apply without reason, those ads on the Lock Screen? You can remove those if you pay for enterprise or education edition. Running pro? Nope you get ads.
I used a thinkpad x1 tablet with rnote for a long time. It was really great except for the battery life.