We definitely focus on ease-of-backup vs. choices-for-backup. One of the initial things we found we the "pick and choose files & folders to backup" approach is what kept most people from setting up a backup at all because they were confused by the process.
Having said that, we offer the ability to exclude folders and filetypes if you have certain things you want to backup later.
(Not disagreeing with anything you're saying...just fyi.)
Gleb from Backblaze