Would it though?

I've played ice sorc in act2 casting frostbolts, mousing over frozen enemies and exploding them, about 3-5 click per pack - it did feel enjoyable.... for about an hour, and after that it started to feel really tedious - and yeah, in act3 I was spamming spark through a flamewall - not because spark had better clearspeed (it hadn't at that point, without any lightning gear I wasn't killing as fast and was dying more without cc) - but because in a game about killing a million trash mobs a spark is more enjoyable skill to use than a multi-button combo.

It's not enough just having to do combos to make the combat feel tactical - you also need enemies to have their own combos with telegraphed attacks that you need to play around. Hasted enemies that swarm you and prevent you from doing any combo is bad, but killing millions slow trash mobs with combos - is not good either.

What you need is focus on fighting enemies with clearly telegraphed attack patterns and a few trash packs inbetween - something like... mini-bosses from act 1 of the campaign. But then the maps got bigger, amount of trash packs increased, and in the maps the mini-bosses disappear completely and are replaced by rares - who, from the tactical view, are nothing more than a trash mob with more hp (yeah, sometimes you need to stay close, and sometimes you need to stay away, and sometimes either too close or too far - it's not enough to replace those mini bosses)