I have actually never heard of this, but I can see a certain amount of 'logic' in 'the thought' of limiting toys, especially with a puppy in a house with young children/toddlers/babies where the dog needs to learn that 'not all toys in the floor' are toys he should chew on.
However, I have never had an issue with that, and I, as a child, had a Yorkie-Poo mix from a very, very young puppy with a toddler sister. I was very careful training my puppy to leave alone my baby sister's toys, and he did. He, while I was at school, chose one of my favorite shoes, a leather 'pixie boot' (ankle height)

for his teething toy and chewed it down to a 'silver dollar' sized piece of the heel.

I gave him the other boot, but his teething days were over by that time.
Brody is EXTREMELY toy centric. He has tons of toys and craves more and we have a hard time finding toys he does not already have. He knows them all '
by name' and is very neat and organized with them. He 'keeps' them in only two (2) places in the house, and he picks up his toys if they fall off, or another Yorkies carries one off...usually for the fun of tormenting poor Brody

...and puts them away again.
I can tell you for certain, if Brody's toys HAD to be limited, Brody'd never survive it...he'd need to be put in a straight-jacket and COMMITTED...