5 (or close to) being far more common (I suspect), that’s an entire category of activities lost for many units.
That’s wings losing 20% of their larger scale delivery as well - 20% of AT capacity lost (again with only 1 or 2 with certain specialist qualifications, or even 3 or 4, that’s 25, 50, or higher loss in that area potentially.
20% of fieldcraft, except no it’s higher in some areas due to extended pauses or currency loss during lockdown and then the changeover of the syllabus…
It goes on…