You never had a problem soultrapping and recharging every 10 seconds? It's not confusing. It's boring.
I never had to soultrap and recharge "every 10 seconds."
After killing an opponent with the enchanted weapon (which is what I would be doing anyway), I press the "1" key (the hotkey for Azura's Star), click the weapon, done. I don't even think about it.
Sure - it's a bit tedious, but it's not really that big a deal. And it does appear to be confusing to many, since in spite of the fact that that's the obvious way to do it, almost nobody on the thread has even mentioned it - instead, everyone's complaining about not being able to find enough soul gems or varla stones or having to cast soul trap separately or having to carry an extra weapon or being stuck with a weapon without a charge. I can only assume that those who are complaining about those things couldn't manage to figure out the simple mechanic of a custom enchantment with a 1 second soul trap and Azura's Star on a hotkey.