One of things I find challenging is understand the meaning of the word "scales". It is sometimes used differently in different contexts.
Can it be performant in high load situations? Certainly. Can is elastically scale up and down based on demand? As far as I'm aware it cannot.
What I'm most interested in is how operations are handled. For example, if it's deployed in a cloud environment and you need more CPU and/or memory, you have to eat the downtime to scale it up. What if it's deployed to bare metal and it cannot handle the increasing load anymore? How costly (in terms of both time and money) is it to migrate it to bigger hardware?