Absolutely not. Part of the whole point of sending the bass through a guitar amp is that the gear is sorta highpassing the thing to begin with; by its nature it's gonna be focused on the mids/top of the bass. Sometimes the guitar rig is there on the way in anyhow with whatever acting as a splitter before the amps- even just a tuner works; anything to split the signal. Part of it too is not over-intellectualizing it or trying to fit it in a system of how one has to do things; I'm not running into a guitar amp because frequencies over, say, 200hz are useful running into a guitar amp, it's because the bass as a whole has a badass distorted tone running into said amp; blend to taste with something that has more bottom. As much as it's recieved wisdom, I don't care for the sound of DI bass at all, especially not for the low end. On the off chance I use a clean DI track for anything, it's for top; a proper bass rig has much more authoritative lows to my ears. Yeah, heresy, I know. Do what sounds right. Plug the bass into guitar gear. Does it sound cool? If so, use it. There are no rules.