That’s what makes Twitter what it is: brief comments.
Anything beyond that limit is asking the reader to take more time to contemplate a more thought-out statement, which is better handled on a forum more suited to the topic.
Twitter needs to consider themselves a “common carrier”.
If you can’t put a cogent thought into 120 characters - stay off Twitter!
I would think Twitter or some similar fast-paced app would give you that option.