You are making a number of assumptions that will obviously break down at some point (otherwise people would be able to progress to where they were eventually benching 2000+ pounds).
I don't have a particularly strong objection to employing a '10% increase' rule of thumb. I just happen to think progression is better served by using somewhat smaller increments, as well as increments that are less rigidly tied to a given percentage of the starting weight. But obviously YMMV.
And I definitely think an increase of 5# on a 225# bar would be more productive than the 50# jump mentioned in the OP.