It's all nice and fast until the GC eats up all the CPU time under memory pressure (e.g. container memory limit). GC deserves its bad rep, even if GC implementations have gotten a lot better over time.
GC also disqualifies a language from ever being used for anything but userland programs.
Which isn't really going to happen or be noticeable in this case. Yeah GC is slightly slower, but it's like blaming a 10-minute mile on your shoes. SDN or DBMS written in a GC'd language is probably not a good idea.
GC also disqualifies a language from ever being used for anything but userland programs.