Bagged Sub-Assemblies

I learned a lot from building Semroc kits.
One thing I found were bagged sub assemblies. The engine mount and recovery system parts were in separate small bags.
The picture shows the engine mount bag from a typical Odd'l Rockets kit.
As a teen I remember tearing open an Estes or Centuri kit bag. Loose parts would fly! A launch lug or engine hook could roll under the table and be lost.

Why don't the big producers do this? It costs an extra three cents per kit for two extra ziplock bags.