Well, this is just my cranky (and maybe "unpopular") keyboard opinion, but… To me anything bigger than 65% is an aberration. 60-65% is a normal sized keyboard, and the so-called 100% layout is merely a relic from the DOS era of the 1980s.
If you look at the early microcomputers, the Apple II, the Atari 800, the Ti99/4A, the Commodore 64, and even the original Macintosh in 1984, they all pretty much came with what we today would recognize as 60-65% sized keyboards. Some Tandys also added a number pad, but it was mostly IBM that gave us the behemoth keyboard.
In those early days many computers were sold to businesses to run spreadsheets (Lotus 1-2-3) and databases. If you're doing spreadsheets all day, or data entry all day, then a number pad is essential. The nav keys were also important to heavy spreadsheet users. These systems didn't have a mouse or drop-down menus either, so every function of the computer had to be controlled through the keyboard. A lot of DOS programs leaned heavily on the F-keys for that. That's the computing environment the Model F and Model M were designed for.
Now that era is long past, and nobody starting from scratch today would design something like that. Most people can get by just fine without a number pad. If you do need one, USB accessory pads are available everywhere; you can pick up a semi-disposable one at Wal-Mart for $8, and you can put it anywhere on your desk. Likewise, the F-keys are no longer central to application control, and most people are OK with moving them to a Fn layer.
Taking away the nav keys, and especially the arrow keys, is a pain point. However, there are a lot of different strategies for dealing with that. The most obvious way is to just add them back in. Thus we've seen 65% keyboards like the WhiteFox and Clueboard that have been very well received.
For true 60% keyboards those arrow keys can be put on Fn layers, there is SpaceFn
https://geekhack.org/index.php?topic=51069.0, or what I did with the Zo64
https://geekhack.org/index.php?topic=92199.0, or you can scrunch some actual arrow keys into the lower-right corner, or if you have one of those accessory numpads you can use it for navigation too. (Remember Num Lock?)
So, to me the question becomes: What's the justification for a 75% or TKL or bigger keyboard? What benefit does anybody really get from that? Not much that I can see.