It's got four things that make it great:
1. Discord/Slack/WA/etc integration so those apps become your frontend
2. Filesystem for long term memory and state
3. Easy extensibility with skills
4. Cron for recurring jobs
Sure, many of these things exist in other systems but none in a cohesive package that makes it fun and easy.
The Discord/Slack frontend reduces friction significantly - particularly on mobile.
With proper sandboxing you get real benefits while limiting the blast radius significantly.
Like, I could run this thing on an isolated VLAN in a VM, but if I hook it up to a SaaS app for its frontend, then it's immediately insecure if the bot is connected to anything of value. If it's not connected to anything of value, then what's the point?