I sell Opencart themes. And my customer can't switch themes because of the cache.
Since most of my customers aren't overly familiar with FTP, there should be a way to let people remove those files.
I love the caching feature. 3.0 is lightening fast. But it's a real pain to develop themes when you have to remove those files after every update. And how to let the customers know they need to manually delete those files.