Your mileage may vary, but it’s still possible to install some distros without those nonsensical containerised “package managers”, or to at least remove them after installation. It unfortunately takes an increasing amount of effort, especially in distros that are actively trying to push their flavour of containerised package manager. (Totally not looking at Ubuntu and Snap)

What is working in our favour here is the fragmentation, which will prevent, or at least slow down a too widespread adoption of those systems.

for security reasons.

AKA to boost sales of new devices by making old devices unusable faster by preventing the user from upgrading storage.