I've yet to see a poll setup that there weren't problems with and this one is no exception. (maybe more so)
That's what happens when you've had a pint on a Saturday night

The biggest blunder is the thread title.
While it was my intent to only capture a profile of how ofter things get tossed I soon realized that most of what gets tossed is replace with after market stuff so I crafted the Poll title to say
"Choose as many as applies. (Deleted or not OEM)"
But of course that title is easily missed.
AND because you have to create the thread title BEFORE you create the poll, you're toast if you expand the scope of the poll while creating it. Frustrating.
Anyway things like "Top End" are meant to cover the whole top end so for instance if you have different cams or ported etc. Yes the Secondary system is a part of the top end but since it is called out separately you have to put your thinking cap on.
Then there are all the various possible systems and things tossed.
The "Secondary System" for instance. I put "Secondary Actuators" but fully meant to say the whole system, "Secondary System".
I also did not get a full list of possible things that get tossed.
I am sure someone has tossed that original gas cap or the original wing nuts that hold the air filter in. I guess they'll just get missed.
In summary. Do the best you can.
This poll info can help people new to the car decide based on popularity if he/she wants to toss things like the steering wheel in favor of a joystick. Or for that matter the LT5 in favor of an LS9.
There is no "why would anyone do that" question.
People just do what they feel makes the car better.
And that includes looking for a secondary system to put back in
the car that they bought.