all about intent
the intended use of the product sometimes determines the requirements and even compliance issues.
A "general purpose laser" not intended for any specific application, can be sold to anyone, and is considered compliant if the product has the appropriate features for its class. So a Class 4 laser would have to have key switch, emission indicator, emission delay, remote interlock connector, etc, along with adequate user instructions.
But the same exact product, if it is described as a "laser pointer" or as a "laser lightshow device" would not be compliant, as laser pointers are limited to 5 mW power, and laser lightshow devices above 5 mW require a variance (both for the manufacturer and the end user).
Hope this creates more confusion...