Jumping to a full frame Z, what to keep, what to sell?

Hi Everyone,

I currently have the following:

• Nikon D7100
• Nikon 80-200mm f/2.8 ED AF-D
• Nikon 18-200mm f/3.5-5.6 ED AF-S VR DX
• Nikon 12-24mm f/4 ED G AF-S DX
• Nikon 50mm f/1.8 AF-D
• Nikon SB-800
• Nikon SB-600

Going all the way back to the D70 my thought has been to buy good lenses to keep "forever" and just consider the bodies to be disposable every 4-5 years.  I'd love to get some inputs from you all as to whether or not this still makes sense.  I.e. if I'm going to get a Z5 next (and an FTZ converter), which of these lenses make sense to keep and which are obviously bested by a new model?

And one question about the F to Z conversion in general... is the "35mm equivalent" unchanged?  I know there is a crop factor difference going from DX to FF sensor, but in terms of the optics, distortion, and overall perspective created by a given focal length on a given lens, will the image be identical?  I'm not clear on whether the big change in flange depth impacts this in some way.

Finally, in terms of "downgrades", is there anything to be concerned about?  It seems like IQ is superior in every way going from an D7100 to a Z5, but the drop in fps has me a little concerned (and confused as to how this could be).  My D7100 is 6fps using the entire DX sensor.  The Z5 seems to be 4.5fps using the FF sensor.  I had assumed, but cannot find any mention of  it, that the Z5 could be put into some kind of DX mode (ideally even when not using a DX lens) and capture a much higher frame rate given that it wasn't having to retrieve the entire sensor.  I know it can shoot video at 30+ fps, but are stills really limited to 4.5fps??  Especially with the cheaper Z50 doing 11fps this seems unbelievable.

As far as my habits, I like to shoot sports (not professionally, but I do like to have great shots regardless).  I also shoot wildlife and more and more I'm wanting to get into macro photography (watches in particular).  This has led me to wanting a 105 micro lens but it seemed unwise to buy another old school lens if now should instead be the time to make the transition to the new system.

Thanks for reading!
Jeff

PS:  What a punch in the gut.  Just as I finished typing this I have discovered that my favorite lens, the 80-200, will not autofocus with the FTZ.