High entry threshold - an obligation or rather an option?

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@Pawelek85

How will I explain why Qubes is a bit difficult to use compared to Windows?

Good read: How to pitch Qubes OS? - #15 by fsflover

And to add to this: there are alternative menus that reseble windows:

• New Qubes application menu
• Replacing the "Q" menu with the better "whisker menu"

@Pawelek85

Why did Qubes move away from KDE (which resembles Windows) to Xfce? Why doesn’t Qubes give a choice of environment, but even imposes Xfce?

You still have the choice to switch back to KDE: KDE (desktop environment) | Qubes OS

@Pawelek85

desktops, AppVM, TemplateVM - what does this actually mean for a new user? Unknown.

There’s already a documentation just for that, with videos, written guides, thorough explanations on the forum… : Documentation | Qubes OS

@Pawelek85

After selecting, for example, Firefox/Gimp/Keepass, the program would offer to automatically install and configure Qubes with the ready-made applications Gimp, Keepass, Firefox.

Multi-purpose templates already exist though, look at how bloated the standard debian and fedora vms are.

Imho it’s all about getting the hand of it, reading the docs as you progress and searching for what you need. There are more pressing issues to be resolved rather than adding features to facilitate newbies, when there are already well-written resources available. Again, personal opinion.