I still do not get where would it take you more time compared to what it takes now to change all prices. You do not have to write down all prices if you are not doing it now.
You don't get it? Please sir, let me illustrate.
Here is what happens right now, on existing servers:
1) I see a fully booked flight priced (Y/J/F) at $130/390/650;
2) I increase the baseline by $10, i.e. $140 now for Y;
3) I multiply 140 by 3 and by 5, respectively, in my head; I get 420 and 700 and update the AS route management page with the new numbers;
4) I plug the number in (I only need to plug in the 140 because Excel does the rest) and update my Excel file with the new price;
5) I close the Excel file and browser.
In this new formula, instead of having a nice and neat Y:J:F ratio, I will have to do the following:
1) I jot down the prices for all four classes (inc. cargo) for one route;
2) I plug the numbers into my Excel file, which gives me the Y:J:F ratio for that particular route;
3) I repeat step 1 and step 2 for several hundreds time because I have lots of routes;
4) I, in my exhausted self, see a fully booked flight with arbitrary pricing ratio;
5) I increase the baseline price by $10, i.e. $140 now for Y;
6) I plug the number in (thank god I only need to plug in the 140, because I can't multiply 140 with some random number with endless decimals in my head);
7) I copy the numbers from the Excel file to the AS route management page and update said page;
8) I can finally close the Excel file and browser.
It is a lot of work to calculate the price ratio for EVERY SINGLE ONE OF YOUR ROUTES, and if the AS team decided that this formula doesn't fit anymore, then what, do we need to update the ratio for possibly thousands of routes on the Excel file all over again? Please bear in mind that we don't run small airlines with 10 routes. This, calculating the ratio for all routes thing, is a lot more tedious than one might think.
May I also add, my airlines went premium heavy on cabin configurations because premium classes are much more profitable after the new cabin rolled out and the new price ratio (Y:J:F = 1:3:5) favours premium cabins a lot more than Y class. So there are (at least) two things that AS team could do if they really decide to stick with the so-called "new formula":
1) cabin refunds (why would I put big seats in J class that occupy more than 2 times that a Y seat occupies, when J fare is less than twice the Y fare?)
2) disclose the formulas AS used for calculating the default price (at least they could save us the trouble of repeating step 1 and step 2 several hundred times)