I was an air cadet on a squadron that paraded only once a week (Wednesday's). The rest of the wing paraded twice a week, we knew that, maybe we were jealous, but that never prevented me progressing to staff cadet or up the cadet ranks, taking part in all the flying, gliding, shooting, camps and other activities on (during the nineties)!
We met some Fridays if the staff had a purpose and we did a lot of weekend camps as a squadron.
As a member of staff I went on to a squadron that met twice a week. I think it was very much, "that's the way it's done here" and in hindsight wonder why I didn't carry across my previous squadrons mantra, except I was probably much younger and keener and glad to do it twice a week.
But I'm pretty sure that squadron that met once a week still won Wing field weekend every year in spite of cadets on the new squadron meeting twice a week and training twice as hard!!
I think with the right focus and structure it didn't matter particularly to the cadets how often we met. Where we met once a week it in no way hindered our motivation, it didn't stunt our progress or stifle the activities programme in anyway. As far as I know they still parade weekly and continue to be a strong squadron.
If I returned to command a unit now, it would only be to parade once a week and have greater focus on weekend camps each term.