ruin the experience skipping the levelling stage...

Not 'skipping', more like speeding it up.
And i would compeltely disagree with you, leveling on vanilla was one of the biggest mistake blizzard has ever made considering how time consuming it actually is.. i'd pretty much bet any of the people that leveled 1-60 on x1 experience rate and missed most of the 20/40 mans raid because of it would choose faster leveling and experiencing all the stuff they couldn't back in the days (aq40/naxxramas) perhaps at it's best instead of having to level for most of the time, and the reason Vanillagaming is offering x1 and x15 experience rate for people that enjoy leveling or either for people that enjoy end-game content that they couldn't experience back in the days.. Either way, vanillagaming staff is actively working and trying to provide blizzlike experience fixining all the non-working quests
<<<Announcement>>> for the people that actually enjoy x1 leveling