1) Suppose you equip two items, each of which has a chance to proc +X to a primary stat (e.g., will). I understand that if the "first" item procs and the buff goes up, you can't get a second buff from the "second item" while the first buff is up. In other words, you can't stack two of the same buffs. However, would it still be beneficial to equip both items to improve the overall proc chance? I.e., if each item has a 15% proc chance on use of a "harmful skill," then you get two bites at the apple, so the proc should happen and the buff should go up more often? Or do you only get one "roll" at the proc, so a second item with the same proc chance is a waste?
2) Suppose you equip two items, each of which has a chance to proc a crit rating bonus, which stacks up to three times. If the first item procs and the buff goes up (tier 1), can the second item proc and raise the buff to tier 2? In other words, is equipping two items with crit rating bonus proc chance a valid strategy for keeping the buff at full potency?