I genuinely take issue with this kinda thing. It goes against the idea of a message board. "Thanks" and "Hahas" are a nice little way to ensure the replies aren't clogged up with emoji replies that convey quick appreciation.
Simply having "agree" and "disagree" options are anti-conversational. Let's not confuse arguing with debating either. Arguing is an angry exchange of disagreement, whereas debating is deliberately addressing specific points, acknowledging what was said, and presenting a rebuttal and/or alternative perspective. The content of the communication is key.
The community's already receded yet again, let's not give people another reason not to return.