[1.2.279] Skill nerfs this time

Yes, but the mobs are not nearly comparable to skeles. And fun fact: By the time you can 1HKO these guys, you can 1HKO skeles. If you kill a mob of 10 skeles, you'll get about 45k exp. If you kill a mob of 8 gaurdians, you get between 48 and 56k exp.
However, a mob that large of skeles is more common than a mob that large at ToT. My point is, Skeles are better exp than gaurdians because the mobs are more reliable and there's less movement.

Hmm really? Let's see: To one-shot Guardians, the I/L AM needs to reliably deal ~94,000 damage on neutral. This is without factoring magic defense, so maybe around 95-97k. Wow you're right. Even with the new Blizzard we will probably only be seeing 18x AMs there. I hope you're right though about AMs not being there, because I am no idea how much MA it will take to achieve 100% 94,000 Blizzards, and how easy/hard it will be to gain the equipment needed to deal this type of damage.