Imo, weapon attacks should add flexibility to martials' toolkits, but should remain at similar power levels to basic attacks. This can be achieved by a combination of:
- reduced damage
- penalty to-hit
- enemy saving throw (possibly in addition to needing to hit the enemy)
Such a system would negate the need for cooldowns on these Special Weapon Attacks.
+1 for simplifying the conditions. At the very least, they should be explained better via hover-over tooltips.