Hello @JimmySky 
Because other software is stuck in the early 2000 or even further back. It doesn’t look appealing to the user. Whereas, Discourse has a modern feel to it. We live in a modern era, time for modern forum software. Personally, I would feel embarrassed to suggest any other software other than Discourse to other people.
Once you get to known the software it is really good! However, the question is:
Will Discourse meet my needs?
Currently we have a wide range of companies using Discourse for various purposes such as but not limited to: gaming, education & development (github use discourse)
Additionally, have a look through the features and customer testimonials Discourse has to offer
Some celebrated features of discourse are trust levels which are configurable by admins. Also, the moderation tools are awesome! We (Discourse) provide them and you use them as you feel is suitable for you.
For more info see:
