Weird I thought I answered this.
Anyway, they ship buggy code on overtaxed hardware that keeps me up at night.
ROS 7 was a disaster from 7.0 to 7.11, and it shipped on hardware that couldn't be rolled back to 6.
MPLS and OSPF have been huge victims of this. MPLS forwarding table often freezing and not updating. OSPF variables conking out causing protocol flaps, or not adding routes to the route table.
Theres other issues too. I could really go all day.
Great homelab stuff. I use it too.