Just to make my own position on Vo2 clear.
In ‘general’ I think it is very important.
The ability to manage O2 is critical to all sports and every sport.
I don’t think testing it is useful however and focusing on it is less important. Monitoring it is however - like Jamirok says though, not on a daily basis.
Every 6 weeks is fine - 4 if you’re paranoid.