Clothes washer repair - hub and spline

Hi, My Maytag MVWC465HW4 which is only a few years old has been making strange noises and after the cycle is complete the clothes are still wet. Simple Google search suggested this was the hub at the bottom of the tub, through which the splined shaft goes through to rotate the tub, and a separate spline to rotate the agitator. So I disassembled the hub and found that its teeth have been completely worn - so I have ordered a new one. My question now is for the shaft - it seems like there is significant wear in a middle ring around the spline, almost as if it wasn’t there in the first place. I can see the spline more defined above and below that ring. Is this at the level that the shaft should be replaced? I haven’t looked into how expensive it would be, or how long it will take to get the part. The hub will arrive Tuesday and maybe I’ll just assemble it at that point and order a shaft and additional hub for when that inevitably fails. Any advice would be greatly appreciated Thank you https://imgur.com/a/SdPfG7l