What I highlighted in your quote says it all.
If it's about weight then a F65 is ideal at 400gr, the F100 is 800grs
Or F80 at 500grs is also fantastic, with little limitations compared to the 100. (worse AF in the dark, and a bit slower AF, but it has two wheels and "mirror lockup").
Both the 65, the 80 the 100 and the 5 all start the VR of modern lenses.
In some situations you want a heavy camera, so you even may add the grip to the F100 to gain weight. A heavier camera vibrates at lower frequencies and it's steadier, you have less shake when shooting handheld with non VR primes, and it counterweights better big lenses.
For mountain Photography a F80 is better than a F100 because of weight. Gallen Rowell primary camera was the F100 (just before his death), but he used extensively the F80 "on treks, climbs, and trail runs". (https://www.mountainlight.com/rowell/gr_camera_bag.html)
...but don't think F5 weight is always a drawback, it is when hiking, in other situations when having to shot hard you may want exactly an F5 like it is.
Nikon F5 with batteries: 1,445g year 1996
Nikon D5 with batteries: 1,415g year 2020.
Canon 1D IV with batts: 1,400g year 2020.
Around 1400grs is the weight a Pro wants to shot hard, in 1996 and in 2020, for this reason a Pro camera weights that.
A9 and D850 are close to F100 weight, they are another concept...
Fortunately today we can own a full collection of Nikon film cameras, an F5 can be had for $250, even if it looks having suffered an aircraft crash it will shot several hundred thousand shots without a single CLA.
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