Yes so this idea popped into my head, now when Blizzard changed the specs and made them more simplistic but less costumizeable ( not sure if this is even a word )

I would realy like that Blizzard added more glyphs to the game so there could be more different playstyles to each spec, and tiers.

An example could be adding glyphs for different tier sets doing cool changes to their set bonusses.
Example: Warlock tier 11 bonus, you could add a glyph increasing the 2% fel spark proc, ofc you would have to sacrifice 1 other glyph, but thats what its all about, you decide how you wan't to play and not someone else, so there would be different sides of every spec.

From my personal view this could spice it up a little atleast.

Feel free to come up with your own idea's.

on a sidenote: This could also resurrect inscription a bit which is quite dead atm.