I agree only on your point that the product is almost completely visible. No need to unpack.
What I do not agree on is the easy to open idea of perforation in the back. That never works.
Either the perforation is to rigid and wont tear without excessive force, I usually get a scissor to open.
A well made clam shell packaging can be opened and closed with press locks and a piece of tape.
If you need to return an item, you can do so in decent shape, if the product came in a completely sealed clam shell (with or without perforation) and I need to return it, expect it to be returned in a plastic bag as the packaging will never go back to its original shape.
Lastly, CFL bulbs need to be in clam shell packaging as it protects the product fairly well, however, when you buy a pack (always more than one in a package) to replace one lamp, you end up with one or more unprotected bulbs as the package never comes back to its original shape. The last thing you want to do is break an spare CFL in storage.