The kind of Qs I'd ask are unfortunately the kind that are useless to current XI or its future, and that the current team probably can't answer anyways.
Mainly curiosities, such as original intentions/ideas that got dropped during an expansion, since from CoP onwards they had a knack for laying out zones ahead of time (to reduce download sizes on the updates due to dial-up concerns). I look at zones like Limbus/Hazhalm/Salvage/Nyzul/Walk-of-Echoes, and it looks like they scrapped one idea and just made unrelated battlefield content within them to flesh out the end game of that given expansion.
There's also stuff like the engraved stones ZNM used for the tier-5 fights, and I wonder if they had a different idea for those in mind originally, instead of a simple case of just setting aside room in zones for making use of later, because there was plenty of that in WoTG with sizable unused areas in E.Ron/Pashow/etc that were blocked off.
The kind of shit that should be answered is stuff like Byrthnoth mentioned. It's 2016, and this game is PC-only now. Adjust or add to the packet structure to allow for dumping of more data in one go to alleviate the need to have loading-icons for inventory in the first place. It's embarrassing.
But this is an MMO, they'll only cherry-pick the easy questions to answer. God forbid you ask if they could do server merges.