Well the main reason is that we’ve had a few decades of algorithm development and refinement. As Fair Issac and other companies gain more insight into how people use, mess up, and recover their ability to borrow, the Score calculations become more sophisticated. Any given score model has to be applied to massive amounts of data, and is used to make millions of credit recommendations. Putting one of these algorithms into use is not a small task, and one of the sellling points to the banks is a certain level of accuracy, consistency in what the score will tell the bank. You don’t go making changes to an existing model that customers (banks) expect to work a specific way.
Instead, a new scoring algorithm is developed, tested, and offered for banks to adopt. The bank then has to migrate its credit analysis protocols to the new model, and makes that investment with the understanding the model will not change.
High Bal Jan 2009 $116k on $146k limits 80% Util. Oct 2014 $46k on $127k 36% util EQ 722 TU 727 EX 727 April 2018 $18k on $344k 5% util EQ 806 TU 810 EX 812 Jan 2019 $7.6k on $360k EQ 832 TU 839 EX 831 Only one app would be interesting now, Platinum 100k, but Gold + Delta Reserve + SPG Luxury + Hilton Aspire covers a lot of ground. Useful cards: Hyatt and Diners and Altitude Reserve. Ch United maybe, on a lark, but not many other apps are necessary. Chase Trifecta is useful, but I'm not sure how long.