Akali is doing exactly what pre-rework Shen was doing

Remember unkillable Shen cuz sustain through Q?

Remember infinite Q poke that dealt minor damage but could be spammed endlessly on a short cooldown?

Remember how going aggro on him didn't mean anything cuz he had a defensive tools to negate damage?

Now add in an insane level 6 powerspike and you have pre-rework shen, assassin version.

The only difference is that Akali's spam poke and sustain are separate functions, meaning she doesn't have to proc Q to heal like Shen did. Which makes her even more oppressive than old Shen was. Not to mention her damage for proccing Q.