I agree with the limit at .25 cid. Although a lot of modelers here are indeed guilty of taking .10 size planes and putting .25s on them and wonder why they fly like a brick and end up a 'balsa fountain' (borrowed phrase) on the field or in the woods.

There is indeed a shortage of good kits below .20cid. that don't cost you your first born.
I think the builders (kit, plan and scratch) exchanging ideas, plans, etc. and tips here is what it is all about.
My nickel; My opinion..
Off the soapbox, now...

Littlefly