Not better, in fact it's closer to the opposite. Playing like butter means you get killer tone and speed with no effort at all. No struggles to overcome bass shortcomings. And usually the emphasis is not on tone, except that you don't have to struggle to overcome fret buzzes or the like.
Mojo on the other hand means a sort of indefinable "personality". And that can be in the looks, the tone or the feel. But more usually in the looks. But like with many talented artists with strong personalities, you often end up with a struggle to pull that magic out of the instrument.
So fretlessmainly who wants a bass that "fights back" is really saying he prefers an instrument with a unique personality even if you have to work to overcome it's quirks, rather than a more bland one that plays with no effort.