Well, in case of ray-tracing and studio... i don't think they're really scattered.
Making a quick raytrace of your viewport isn't the same as setting up a render or animation.
As for ipn's... i guess there could be improvements there, but having it as a separate document does make it really clear what it is.
I'd imagine it could somehow be integrated in the assembly document, but you'd have to be able to differentiate between exploded and non-exploded states and their respective features properly.
That would probably lead to very bloated documents that would be more error prone.
Niels van der Veer
Inventor professional user & 3DS Max enthusiast
Vault professional user/manager
The Netherlands