You are getting down voted but you are right. But if companies making software would support Linux natively this would make a huge difference too and that is not the case now

What I do is use distrobox or any devpod and install it in the container and launch from cli. Works perfectly for me.

What you’re saying is correct but all the things you’re describing are not 100% foolproof. Flatpaks are community maintained and can contain misconfigurations.

Also the sandboxed nature and all these foreign concepts for new users would have a user question why they’re not seeing their folders or why their cursor or theme doesn’t match their system.

These systems are great but they’re not nearly as polished as Windows and Mac.

It’s great for us but Linux has always struggled with any semblance of full polish. I think you’re overestimating the average computer user. Probably Ubuntu based distro’s are still as close as we got to an OS for the regular person.

The introduction of new concept could be mitigated by a proper system of introducing and explaining these to a new user but it’s difficult not to overwhelm them with info or keep them engaged and willing to learn.

TLDR;

True but it’s not that simple