Kyle, there is a specific design forum here on MSW.
If you're interested in 'how' and 'why' when it comes to surfboard design, it may be worth posting these types of questions over there. You can also use the 'advanced search' facility to see if someone has asked a similar thing previously.
For what it's worth, as fin systems go then Lokbox or Futures are my choice... They just feel better IMO. FCS entered the market at a point when any previous systems had fallen by the wayside and most boards had glass-on fins. I guess they found a niche at the right time and business grew.
I also agree with you Re: knockouts... Can't remember the last time I knocked a fin out, although I'm probably due for one