It was almost exactly word for word the same "maybe this is why" argument that flared up last time which drove the conversation completely off topic.
If there's some reason why my suggestion might be a bad idea, by all means, throw it out there.
Different people read posts whenever they are posted. You have an entirely different audience each time something is posted. Your contribution is valid each and every time you post it. And someone coming in to give their experience also has a valid point each and every time they post it.
From never having seen your suggestion before, and just reading along in this post, *no one* snapped at you *at all*. Your "here we go again" was an overreaction, IMO.
It's just like when someone asks about upgrading a ticket they bought ahead of time. At DLR, the policy is to charge the difference between gate price and what the person *paid* (different from WDW's policy). Some people, sometimes, get a nice CM who charges them as though it's gate price minus gate price of what they had, or discounted price of ticket wanted minute discounted price paid. That's lovely. It's not policy, and it's not everyone's experience.
So it's valid to say "this might happen", and it's also valid to say "but don't expect it", and that's the exact same situation here.
As for the why.... IF the AP e-tickets didn't expire, I could think of the situation where *this* year I only need a Deluxe, but I have some money to burn and next year I will need a Premium. So I buy the Premium e-ticket, play the game at the parking garage, getting free parking until it's time for me to get the Premium activated. And then I get free parking for the year of that AP. Even with it expiring, it's a few months. So if I played the parking game, I'm getting free parking for those free months with my Deluxe, and then I get the Premium's parking for the year of my pass once activated.