Well, the D7500 deletes the second card slot. That might be a feature you need.
Save you a lot of money buying many cards. Also the 20MP produces smaller files than the 45MP D850 so you don't have to buy large cards. If you use MF lenses it saves you from using any automation so you will be the expert.
This isn't difficult. Compare the features you want and the features you need. Look at your budget. Decide. Don't look back and don't listen to anyone who says you're wrong.
Sometimes we complicate the decision a bit too much!
Yes, you must have seen the But the email was for real. They sent me 2 emails (one for each camera) for the firmware updates, so they are both in the system.