the D7100 & D7200 have the same focussing screen as the F6 as you can see in Nikon's website under specification.
The D500 VF has other constructional advantages, possibly a better Prism. Original Listing price of more than 2700€ with grip which I paid allowed for superior construction
I am not convinced regarding the statement "same as the F6 screen". This is what I find:
D7100: Type B BriteView Clear Matte Mark II screen
D7200: Type B BriteView Clear Matte Mark II with AF Area Brackets (grid lines can be displayed)
D7500: Type B BriteView Clear Matte Mark II with AF Area Brackets (grid lines can be displayed)
D500 : Type B BriteView Clear Matte Mark II with AF Area Brackets (grid lines can be displayed)
D200: B-type Bright View Clear Matte II (from DPreview, Nikon no longer have specs for the screen on their web site)
F6: Nikon B Focusing Screen for F6 - Standard Matte Screen with AF Marks & 12mm Center Circle (Replacement) (this one was from the B&H web site)
Type B just means it is an all matte screen for normal lenses. The F6 is not listed with the "mark II" specification as far as I could find. Besides that the F6 screen is too big for the DX bodies... So I am not sure where the saying that D500 has an F6 screen comes from, nor that there is no need to change that screen with a more matte one for manual focusing, while the other bodies will need so (according to spec the screens are the same...). The larger viewfinder certainly is nice, but I have been using a DK 17M with my D200/D7100 which probably provides about the same magnification, if not brightness.
Perhaps there are variations hiding behind the Type B BriteView Clear Matte Mark II designation?
The D500 with the latest offering is still about 2x the cost of a refurbished D7500. Is the better viewfinder and AF worth that much?
On the low side is no mode dial with U1/U2, worse battery performance, Larger size and weight (loading my tracker more), battery orientation limit ability to shift sideways on L-bracket (for balance adjustment on the tracker) and still be able to access battery.
An importantly: How does it perform at really low temperatures? During my last evening dog walks at -36°C, my D7100 performed without problems and battery change through the walks. (The D5100 flunked out halfway at 10°C warmer temperatures, which makes me wary of this issue. While it is possible to swap with warm batteries, it is an operation that usually requires taking gloves off...).