Just here to point out that an automatic reaction system as opposed to a pop-up that offers the option of using it doesn't just limit builds in edge cases.
While not a true reaction, paladin's smite is something you can apply after knowing that an attack is a hit, which has lent itself to being used on crits for maximum value. While it's not the only time you would want to smite, if you are low on smites, it may be the preferred use.
Counterspell, as another example, can be used to counterspell another counterspell. Sometimes, this is the preferred use of the spell - to ensure your own cast goes off. In an automated system, I'm struggling to see how a toggle handles this. It's a hefty balance change to have an option explicitly for a particular spell, since you can't be sure of the spell beforehand. I suppose you could have a toggle that counterspells only on a reaction, but at what point is it 'too much' when comparing UI clutter to the slow-down of combat the bespoke alternative offers? I would be much less pleased with an automated system that either can't be done on the fly or is a mess to go through than I would with a system that slows combat for a single decision that can be made quickly.
I'm interested to see how in-depth the system is when we get our hands on EA, and willing to eat my words about reactions if it turns out to be some excellent solution I'd not thought of.
