Take Ubuntu, for example. It’s one of the most popular and recommended distros for non-techy users, but just look at the install process: https://ubuntu.com/tutorials/install-ubuntu-desktop#1-overvi...
Let’s be honest, I don’t think most people would actually go through with that.
One idea to fix this and get more people to switch would be for Ubuntu to offer a Windows app that handles everything. It could download the ISO in the background, format the flash drive, install Ubuntu in dual boot with Windows by default, and clearly explain each step so users know how to start using Ubuntu or go back to Windows.