Because a dna 20 can provide more power than a mech as long as you keep the resistance high enough. There is a 6 amp cutoff though. Basically. If you can provide the voltage, there's no reason to sub ohm.
1. There are vv and vw that handle less than 1 ohm loads.
2. There's no inherent reason, and no, safety is not an issue. Regulated mods manage power independent of load.
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