The benefit of Specializations is mana preservation. It allows you to extend your mana pool or decrease the number of stops/med breaks you take.
The benefit of Quadding as a soloing method over charming is that you can take larger breaks inbetween quads. You burn all your mana quadding then AFk for 10min watching TV or whatever before you go again.
Whether you finish the quad with 10% or 30%, you're still going to have to take that long AFK where you are likely doing something else IRL. The only time it would factor in is if you have a few bad resists, you are under geared or you're trying to quad things like hill Giants or Seafuries with lots of HP and mediocre gear.
Depending on the level and the camp, generally you can get 1-2 quads done before you run OOM. At which point you usually will just med to full and go again. Specialization may save you a minute or two inbetween med breaks, but many people who go the quadding route and AFKing more time than it takes them to med to full anyways so they won't notice the difference. They won't be sitting at the monitor watching to see when they hit full mana and then immediately start. They'll probably AFK 10min and come back after they've been FM for a few min.
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