Missing the zeroth option in the "doing Fn right" suggestion list: don't use Fn.
I have a keyboard here with a handful of extra keys at the top which do all these functions that the author is showing as Fn functions on their keyboard. Isn't that simply the right option?
Also on laptops: yes, I want to change the brightness regularly, but also I use the function keys in applications that support them. There's already like 100 keys on there! How much do the extra ones cost? I don't buy the cheapest laptops anyway, I'll buy what I think will work the best. No manufacturer offers this option though. Even Framework has only half-height escape and function keys shared with Fn triggers :(
I tend to go for keyboards that don't need all of that messing about with the Fn key, too.
By the way: It's a lot more than 100 keys. People tend to accept that because they have what is called a '105-key' keyboard that it actually has 105 keys. One of my '105-key' keyboards has 124 physical keys. For approaching a decade now, I've wanted a 127-key keyboard from Brazil. Formally, that's a '107-key' keyboard.
* https://news.ycombinator.com/item?id=24499899