Tb6600?

[Ger21]

No, there's no problem using just one power supply. A single power supply is preferable, imo.

I know I can be using a higher rated power supply (closer to 50 vdc) for optimal torque

Higher voltage gives you more speed, not more torque.
your machine will be twice as fast with 50V as it is with 24V.

You usually see kits with multiple power supplies when the current requirements are higher, as large high current power supplies can be expensive.