Such as adblocking (pi-hole like experience without additional gear)
ssh access, printserver, dynamic DNS, VPNs, different routing protocols, vlan support, tunneling protocols, monitoring, home Automation, wireguard, wpa3, OWE (encrypted open wifi), lots of goodies known from other linux distros, etc
Here are some pointers on whats possible: https://openwrt.org/docs/guide-user/start
Edit: added examples. And er, that stuff is ordinary for me :-)
Possible on Asus hardware using the third-party Merlin firmware as well:
* https://github.com/RMerl/asuswrt-merlin.ng/wiki/Entware
* https://www.asuswrt-merlin.net/features
The default Asus firmware is decent too.
1Gbps down but 30 Mbps up seems reasonable.
My Mikrotik hEX can max out that 30 Mbps without any trouble.
I'm not 100%, but it may actually be 370Mbps down, but I don't want to advertise that number without being sure. I replaced it with a RPi4 as a router-on-a-stick WG gateway. The RPi4 has no problem keeping up with my 500/100 fiber connection.
The RBM33G has a pretty weak MTK7621a dual core 800mhz MIPS cpu.
I should setup two of them and run some proper benchmarks at some point.