This is a bit misinformed.
Litany is by nature, a RNG buff. It is also 15% Crit rate which means it is the stat itself not the %. So while it is true that it pretty much gets exponentially stronger as the expansion develops, at this point we are at the beginning of the expansion with the lowest max ilvl. Not only that but litany is a 3min CD which means it only gets used 2-3 times per fight, for 20 second uptime. This means it gets a total of 40 - 1 min uptime depending on how fast your group is. However I agree that litany is good, it's not amazing by any means especially not at this stage in the expansion and especially since crit was nerfed so most classes are stacking DHit now AND a lot of DPS lost internal release (and WAR).
Dragon Sight is just bad. Not only is its range bad, it will only contribute about 1% dps on ONE player in a fight. So even if that is a 5k samurai, they are only getting like 50 dps. It's more of a buff for the DRG to make up for the gimped BfB but it still doesn't equal what BfB used to and it has a worse timer.
Piercing is probably the most consistent of the buffs, however as it is now 5%, it isn't as useful as it once was. That isn't to say it isn't useful, but the 2 dps that benefit most from it are the 2 lowest dps. Now, BRD actually does pretty well in fights, better than DRG on average but BRD doesn't even benefit significantly as a large portion of their damage comes from dots. It also only buffs a small part of RDMs rotation.
All in all DRGs 3 'offensive utilites' is less consistent than trick attack, and DRG is like 200-300 dps weaker and cant manipulate agro which is especially important due to the current state of tanks.