Actually, it's not just paranoia, also convenience. Qubes allows very convenient separation of different parts of your digital life, like personal files/apps from working ones and from random internet surfing. Also, IMHO it's more convenient to copy-paste passwords without an actual password manager. More details: https://forum.qubes-os.org/t/how-to-pitch-qubes-os/4499/15
> Were you ever concerned about opening your online banking/entering your credit card in the same browser where you go to random websites?
Nope. This is from the late 90's when we started entering credit cards and people thought it would be unsafe. In reality, the credit card companies have covered these charges forever now. Otherwise, we wouldn't be using them today.
> Are you tired of remembering tens of complicated passwords?
Tens? I have hundreds and I don't know a single one, because I already use a password manger. What an odd thing to pitch.
I could keep going, but I really don't like how that pitch deck is just trying to cater to made up fears.
What if I am storing my passwords in clear text in a Qubes OS [0] virtual machine with no network?
[0] https://qubes-os.org