Only on the XIV official forums are the efficient players called carebears by the carebears...
1) None of us know the intent of the developers except for what is explicitly said in interviews or in game. Anything else is projecting your own ideas onto them. For the record, the dev team has never made a blanket statement about the skipping of trash. The only thing they did was change conditions in 2 dungeons to access boss enemies. You can still easily skip large swaths of trash in both of said dungeons to reduce the time spent per run considerably.
1a) Nowhere in any dungeon is "kill X enemies" or "clear the area" an explicit objective. It's always "access X area" or "defeat X" or the like. The only explicit objectives we are given are to get to the boss and kill the boss. Anything past that is up to us to determine the best methods.
2) Only carebears insist that everyone else play the game their way. Speed runners don't care if people do non-speed runs, they just choose not to participate. Some may be childish and rude about it, certainly, but they don't demand that the developers make every run a speed run. Only carebears want to change the game mechanics so that everyone has to play how they think is "right".
2a) This thread is asking for more incentive to kill trash (e.g. voluntarily give up speed runs). People are driven by incentive, and judging by Camate's post the devs are beginning to understand this better. Gaining access to a boss is extremely flimsy incentive, thus why so many people are still looking for ways to speed that process up. There is no incentive to kill 90% of the trash at 50 (only the bare minimum necessary to unlock the boss door), and this thread is asking for that to be changed. Believe it or not, us "elistist" speed runners want more reason to engage with content, but there has to be something to make it worthwhile.
I have a 3 week old son. I have a full time job. I have a wife. I have a house. I don't want everything handed to me, but time is the most valuable thing I have right now and I don't want to waste it on worthless exercises. Trash in this game, at level 50, is utterly worthless unless it specifically advances a dungeon objective. Even the rare crafting drops are basically vendor trash on my server (with a few exceptions) and you can't count on getting enough chest coins to offset repair costs, especially as a tank. I speed run because it's the best use of my time. The moment SE makes the trash worth killing, I'll kill it happily.