Hi Eli,
Yes, the decoupling can be reduced. An example is the DRV8412EVM (figure 20 in the datasheet) and DRV8432EVM (LINK to zip files)
Both use a single 47uF instead of a 330uF.
We will investigate the 330uF recommendation. It appears to be unnecessary based on the fact the DRV8432EVM (with higher current rating than the DRV8412)operates.