The planned changes coming in 2.2 have opened up a unique opportunity for class balance in the form of borrowed power, primarily wrt Relics becoming charms in the form of enhancers/enablers.
This had me thinking: Because class/spec balance is so difficult to finetune, adding borrowed power (oskills/stat sticks that are readily available/but not exploitable) may be just the remedy we need.
Games like WoW suffered from borrowed power because they were class-specific in nature and led to twice the balancing issues the game had before. If The MXL devs implement homogenous borrowed power that can be used by each class (in the form of *up to* 3x relic charms that provide meaningful boosts/oskills), it will open endgame/spec-specific content up to underplayed classes/builds in a manner that wasn't previously possible outside of "pay-walled" relic abuse.
I think this is a huge step in the right direction and the cap on relics will act as a great equalizer that the mod seriously needed.
That isn't to say Oskills should completely dominate/replace innate talent tree abilities, they should just act as an easily attainable complement/supplement to builds that are lacking in a single department (boss-killing skills / Farming skills) so that you never feel "locked out" of certain content just because you chose class x or spec x.