I agree with the general sentiment; that F-mount glass is still quality glass, and that there are some real bargains out there in regard to DSLR bodies and F-mount lenses for people looking to build/expand their kit. On the flip side...
I'm approaching retirement. Not there yet, but in the next two-three years. I have sold off my DSLR bodies and replaced them with the Z9 and the Z8, and I have sold all of my F-mount lenses with the exception of the 500 PF and my 1.4X TC. I will probably sell those off before I retire and replace them with the 600 PF in the Z mount and the Z mount TC, because I don't know how much longer those bodies and lenses will be supported, how readily available parts will be, etc. When I retire I want the kit that I will use from that point on, and I'm about there (if they come out with a mirrorless version of the D500 all bets are off), and I want support/parts/etc. available for the gear I have.
I'm approaching retirement. Not there yet, but in the next two-three years. I have sold off my DSLR bodies and replaced them with the Z9 and the Z8, and I have sold all of my F-mount lenses with the exception of the 500 PF and my 1.4X TC. I will probably sell those off before I retire and replace them with the 600 PF in the Z mount and the Z mount TC, because I don't know how much longer those bodies and lenses will be supported, how readily available parts will be, etc. When I retire I want the kit that I will use from that point on, and I'm about there (if they come out with a mirrorless version of the D500 all bets are off), and I want support/parts/etc. available for the gear I have.