I mainly use various Linux distributions since 90s, also while working in systems administration for most of that time, but to say that "all Linux distributions are essentially packaging the same software" and suggest that's all is a vast...... understatement to say the least.

Different kernels, different system libraries, GPU drivers either no free or open source, kernel patches available or not (because there's a conflict no one has time to fix), security patches' availability (with distinct difference between RHEL-adjacent distributions and the others), different init, even filesystems and window managers with their quirks.

It's bordering on false to suggest all the tasks can be easily replicated in all the distributions, which is also the sentiment among the users. Oh well, perhaps, if you spend infinite amount of time preparing a very specific ansible playbook which will bend and coerce this specific flavour to install all the necessary libraries and patches, kick the kernel just right, and backport the Improvements from the incompatible distribution to the chosen one.

Then yeah.

Perhaps. But you're basically saying MacOS is FreeBSD.