After reading some comments and your replies my thoughts are:

• 75% does have nearly the same functionality as a TKL, but aesthetically I think the TKL format is more balanced and visually appealing. 75s do offer that functionality in the size of about a 65.
• For the majority of people, for everyday workloads, I think F keys are largely vestigial. For the oft chance you need it a Fn+number is easy enough.
• I feel like there has been a lot of 75s coming out lately. About a year and a half ago 75s were the hot shiz, 65s made their comeback, and now we're back on the 75s.

I had an ID80 and gave it to a friend. My current keyboard rotation is a Mode65 and a StackedTKL. I have a Brutal60 but I stopped using it. People always talk about the arrow keys with 65%+ but for me I miss having a couple nav keys the most. The arrows are nice too.

I think my ideal layout is a F-rowless TKL. But those made are usually relatively expensive and limited :(