Everyone is always arguing on here about having multiple characters whether the same 3 or all 3...
I know it aids levelling up quicker and gives your more opportunity to raid and nightfall more but tbh I'm just happy being a lone warlock..
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It's a bad idea. If you want to just play one character, that's fine, just know that you limit your potential rewards every week. This is why many who like playing just one class, make 2 additional level 20's of the same class and trade gear over to do weekly strikes / raids.