The point is, with it, being a one to one transmission, RPMs are slightly lower and slightly lower on the torque curve, unlike the Mastercraft and nautique which are higher in the torque curve. Therefore, it could give the perception that it is a slightly softer pull, hence a move up to the Bs.
But it’s hardly “soft” or underpowered, just a different feel for them.
It’s not a deficiency necessarily that Malibu doesn’t use a reduction transmission. They never have, even when, for example, the power slot begin usage for Mastercraft long ago. Malibu was able to save weight and generally run a few miles an hour faster than MC and cc, and hence was the preferred inboard barefoot boat for a long time, save for the specialists like Sanger.
The real difference will be in jump.