You can argue all you want about whether or not this or that situation warrants a short reply, but you should look at the big picture. A lot of these short replies could have been avoided by that or that manner, but some others cannot be
Even for the short replies that could be avoided, doing so it just annoying, and bypassing has became acceptable (nobody cares about it), and so forumers don’t follow that rule
If roblox wanted the forum users to make long replies exclusively, they wont achieve that with the character limit, it just doesn’t work. An easy alternative for forum users is needed to act as an alternative, that will fit their use case
I’m saying this in the scenario where roblox would want to change the current situation. The current situation is not that big of an issue, and it can be argued to just let things how they are right now and not care about it