I feel like Blizzard is once again repeating the mistake that they allegedly just learned from.
Blizzard decoupled AoE vs single target talent rows because there wasn't really a choice. For AoE fights, pick AoE talent. For single target fights, pick single target.
It's going to be the same thing with execute vs non-execute talents. For encounters where the last phase is the hardest, pick the execute talent. For all other encounters, pick the highest performing talent.
So I'm a little puzzled at the design direction Blizzard has chosen here. These execute talents should either be baseline or simply removed. Otherwise we'll be back here in the 9.0 Alpha saying how putting executes in talent rows was a bad decision.