This is not the first time I've seen this advice, and I'm not sure I buy it in theory. NO disrespect intended, but I do a lot of work with high pressure water. The similarities between water and electrons in terms of "flow" and "pressure" are undeniable. If I have two hoses connected to a common source, and one is short and the other long, as long as the orifice at the end of the hose is the same size (resistance), both hoses will have the exact same pressure (heat). Water, like electrons, will take the path of least resistance until it all balances, and it will.
So I think if I had a 4 wrap on one side, and a 6 wrap on the other, of the same diameter wire, electrons are going to take the path of least resistance until they balance. The 6 wrap side is going to produce more vapor since there is more surface area, but they will both achieve the exact same heat, as they are of the exact same resistance per unit of length. One is just longer, so will have more TOTAL thermal mass but will heat and cool in the same amount of time. Otherwise, I don't see a problem.
Even if different diameters of wire were used, it still wouldn't be a problem, The electrons are still going to take the path of least resistance, until they balance. One coil will just take longer to heat up and cool down. Performance wise, not ideal but we're not violating any natural laws or posing any kinds of risks.
In any case, not a big deal but if I accidentally wrapped a dual with a 6/5 on one side and a 5/4 on the other, I wouldn't tear it apart, I'd just vape it (and I am

)