With "normal" usage there are very few occasions when there is a need to purge the cache (and even in development I hardly ever purge the cache) so I can see little advantage with having this on every page of the ACP - not only that it would make extra work for extension developers having to put it on every ACP page of their extensions.
Remember: You only know what you know and - you don't know what you don't know!
My CDB Contributions | How to install an extension
I will not be accepting translations for any of my extensions in Github - please post any translations in the appropriate topic.
No support requests via PM or email as they will be ignored