Is it advisable to put user data on a separate Windows 10 partition

I have a desktop PC with a 1000 GB hard drive. The OS is Windows 10 Anniversary Update. I have the OS and programs/apps on C: partition of 150 GB and user data on D: partition of 781 GB. I have a system image backup, taken recently when the PC was functioning OK. I backup the user data daily, using File History. If I have a major problem that requires re-installing W10 I can do that with the image backup.
My question is, do I really need to maintain a two partition strategy or have the backup tools of imaging and File History made this redundant?

Swarfega, thanks for your response. I forgot to include that I have an external drive I save the system image backups to and another external drive I save user data to.

There is an advantage in having a smaller separate system partition on drive C: so you only have to image the C: drive (and hidden system partitions) to recover your system. This results in smaller and faster system backups. But you still need to back up your user files on D:

I don't recommend putting data in a separate partition. A separate drive, yes. On the same drive increases the read/write heads travel distance moving from apps to data and reduces performance. On the other hand, using two different drives allows asynchronous reads and writes (both sets of drive heads working simultaneously) and improves performance and tends to lessen wear and tear on both drive mechanisms.