Thanks for the pointer and I understand the concern. However, IMHO, this is the wrong way to solve the problem.
What you do: Just going back to the “old” technology, because it does not work.
What should be done: Fix the “new” technology, so it works.
In a more specific way here, e.g., there is actually a way to make it work as flatpak is pretty flexible and with the correct privileges you can make apps break out of the sandbox to run commands on the host. This is usually all, it needs to fix the usual problem.
Unfortunately, it needs a little setup, but it’s possible. Actually, I’ve now explained it in detail in the thread you linked: