So the main argument is that it would make leveling a toon even faster. Is anyone able to quantify that? Single lifers as of now can be leveled in a weekend. Single TR's can be leveled in a weekend if grinded out by hardcore players (the ones who only do quests for xp/min). 36 point builds have been done in 3 days and many on my server currently can knock them out in 2 weeks each life.
Personally, It took me about a month on my first 36 pt build.
My point is that the hardcore (5% maybe) of the population who only cares about the fastest way to do things can already cap toons in 2 weeks. Do you think that running stormcleave a bunch of times would make that much faster? Seems to me that the HUGE exp quests (von3, shadowcrypt, wizking, littany) always get grinded down to nothing anyway.
So really you are just trading maybe 1.2kxp/min for 1.5kxp/min quests. I looked around for a modified xp/min chart since bravery bonuses but didn't really see any.
Still, many people choose to run vale for GS ingreds/fun. Many choose to run Amarath for the same. Same goes for orchard and GH. I wouldn't want to bank 13-20 personally, but if someone finds that is better for them, I wouldn't have a problem with it.