Many of the few may have been reservists but they were current and very competent. Reservists today have to do a minimum of 19 days a year. How current and competent are they?
In the fleet air arm aircrew reservists have to be ex aircrew already and many are current civvy aircrew and bring much to the party. As do many others.
The issue is the weekend warriors who think this is all a jolly good game, do the minimum time to qualify for the money and cost exactly the same if not more as a regular to train to the same standard and thus negate their effect. They then get bored/scared and walk away back to their comfortable jobs without so much as a look back.