Maybe I'm missing something but I thought SBA did as well, assuming that by dependent attributes mean that attribute options (option values) are "different" dependent on the previous selection. So like certain colors of shoes are available only in certain sizes for certain genders, if the gender is selected, with the next option being size, then all of the sizes applicable to that gender are displayed, then after size is picked, then all of the colors that match that gender and size are displayed... If that is what is considered dependent attributes, then it is supported. There are a few kinks to work out when attempting to display the out-of-stock message along with that series of dropdowns, but it does do it.
Don't get me wrong, I'm sure the advertising for the product helps, there's a free trial use I think. To each their own, but it seems to me that to address the situation described that something like either of these would address the problem.
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