I had read that you must replace your brood comb every so many years because each time a bee hatches out the cell gets smaller.
It takes 3 years to get brood cells so old that light does not see through.
In southern climate brood generations are more, and combs get older and smaller faster.
If that is true then it makes sense that cells for wild bees come in all different sizes.
I have seen old combs and little bees. BUT When combs get too old, bees bite combs in pieces and carry rubbish outside. They build new combs.
But you really realise, that if to get rid off mites is so easy, why mites are still in colonies?
I may say superstition
, but it it is better to keep mouth shut