I use input validation by text length (max/min) quite a bit.
It would be very helpful if I could see a character count as I write. This would give me a a heads up, before I hit the limit and then realise that I should have been more concise in my first six sentences.
Also when I paste text into those fields and I see that I am over, I have no idea how much I am over. Removing text then becomes a guessing game until I am under the limit.