The problems are glyph and legendary.
There is a glyph, which gives you, updated enough, +200% crit damage on core skills.
Same for legendary, “if a core or master skill crits, get +40% attack speed”.
And that’s force player and there builds out of basic skill in the lategame, they simply do not get enough “+DMG” support over glyph and paragon, to stay competitive.
Min-max means stacking +DMG modi, and +200% critical damage will force all classes in endgame into a “core skill” build.