Interesting article and viewpoint, but these don’t read as “friction” to me. I think the definition of friction here needs to teased out and pressure tested more for a more meaningful argument.
For example, the confirmation modal about deleting a folder is surely not friction. It is an intended experience to prevent a user from accidentally doing a destructive action. All destructive actions in UX are handled this way. You could hardly call that friction. Actually, if that modal wasn’t there, it actually could be called friction because now I might have deleted something I didn’t want to and have to change my path of “work” to either recover or recreate those files.