No not like the info box that a lot of people don't actually read.
I know that it is not needed for everyone, I for once never had to clear cache. But for each maintenance, I have at least a couple of players on Skype or discord having this problem (solved by cache) and there is across all domains people posting here.
So a easy solution to implement would be a simple:
"Hey, there has been a maintenance, if you experience any problems, please empty the cache by doing this or that. If the problem still exists, please contact support in game"