New
#1
Good question.
Part of it has to do with their mediocre software design, which is nearing bloatware status.
Nevertheless, here is the answer - agree with it or not.
Microsoft Edge and Chromium Edge confusion - CCleaner - CCleaner Community Forums
HTH
The "Temporary Internet Files" folder isn't just used by Internet Explorer. Internet Explorer will be retired but many applications use some of it's components and I don't expect they will be removed anytime soon. As long as the folder may still be used I expect CCleaner will provide the means to clean it.
I agree with the comments made above but one important note.
Do not use the CCleaner Driver Updater!
That's it.