Admittedly, yes, but it does (in 3e, were it to be there) mean that Cha is less of a dump stat, even in a very minor way. While it does create the dichotomy mindset you claim, the fact that they also work with other, different, things, dumping one of them may simply not be an option. Furthermore, if we make more stats 'dumpable', as it were, isn't that solving the problem of Cha being a dump stat? Essentially, if everything is dumpable, then Cha is no worse.