Several good points in your idea macer.
First, the idea of using the x-y axis is brilliant if not for two problems...1) It would take to much paper. and 2) Chess players have enough on their mind trying to plan (and win) the game, they don't need the extra stress of putting the correct formula down.
Secondly, for every move the position would either increase or decrease in your favor. So black would start at the top of the y axis and white would start at the bottom (naturally). But then comes the problem of not using a engine...someone in the top 10 would have to be at every game to place the score correctly until one side gets above the x axis and the game ends.
I think you missed the point entirely....1. He isnt suggesting changing of how we notate, hes just proposing that cartesian planes could be used in how we think about chess. 2. Even if the notation were changed, it would not mean we are writing "formulas". All it does is change the column letter to a number. For example, if as white the origin is the bottom left corner, then Nf3 would instead be N6,3...or something similar.
As for your second point...i have no idea what you are talking about...
First of all, it would be way to hard for a player to remember what formula to write down for his move...he would literally sit their for 12 seconds eliminating the wrong ones. Only new players or very young ones would ever be comfortable using this form of notation.
I think you missed the point of plotting a x-y axis while the game is in progress as to keep track of the game...it would be quite faulty since you play 3.-5 you will jump up 7 lines while playing a pawn move would drop you
Wow...I remember playing that in the mid-1980s....Don't you wish you had an Apple I though???? They are worth $200,000 now if you can find one it's a definite "Bingo"..., even and Apple II is worth $1600.
http://www.usatoday.com/story/news/nation-now/2015/06/01/rare-vintage-apple-1-computer-auction/28299275/