That limit is there for a reason: encouraging civilized and constructive conversation. If all you have say is , ‘cool’, or ‘ok’, just leave a like.
Now, please, we’ve been in operation for two years and everyone is fine with all the things you’re listing. Don’t make such a drama and suggest we NEED to fix some gripes that only you have. Enough.
To not give false expectations: the current behavior is core Discourse functionality. It works fine for everyone else except you, and will not be changed.
If all these things bother you so much, I suggest you no longer use this website.