I would have to look at the stats again but I remember that at least 20% of the maxlevel characters *clear* savage. (even more do X1S or X2S)
In these 20% there are players that are quite bad and those that are quite good.
The goal is to get the bad players to be less of a hindrance and thus people that are good or at least average actually have a chance to beat content with bad players. When that dude gets to have his buffs rolling even though he missed the positional alongside other stuff, his DPS will not be 3000 DPS at the end, but 5000, yet not 7000.
Meanwhile the "pro" will still see a difference in DPS when he does everything properly. At the same time even the "pro's" performance will not tank just because he made one or two mistakes and lost an important buff, such as DRG losing... what's it called... I don't want to look it up... "dragon boy form"-whatever and such.