Instant lets the mob swing 1-2 extra round for like 200-400 damage before target dies, downgrading the need for a 250mana nuke to a 160mana one. If you're reverse charming a couple mobs or just chain killing that 90mana economy per mob can make or break your sequence. Reverse charms are quite mana intensive but they're the fastest burst exp.
You can always cast and cancel ROST or regular invis but you're adding extra steps and more risk. GGR lets you trigger it precisely when you need it.
Your video shows it is possible and I've done it from 12 to 44 but we both know you won't get consistent results especially toward end game conditions because a lot (or very little) can happen in 5 seconds. I personally lost a lot more mobs and mana before GGR. I'd probably be better at it today than back then but GGR takes 90% of the guess work and the fumbling out of the equation.
If you're 60 and you don't care about exp or you're not interested in maximizing efficiency the ROST is the better ring but you just cannot deny with a straight face that GGR gives you more precision on charm breaks with less hassle.
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