The old, ornate Aces of Spades are really cool - I love the Tally-Ho AoS in particular, basically unchanged from day one right down to listing the former manufacturing company's name instead of USPC. The modern Western trend has been towards simplifying anything that's considered emblematic for easier recognition - look at the old NASA logo (the "meatball" starscape with swoosh) compared to their '80s logo (the "worm" lettering). Even when they switched back to the meatball logo to remind the public of their long legacy, they made a simpler version of it.
I'm guessing that over the years and brands, USPC made many variations in the AoS (yes, Bicycle wasn't the only brand that utilized the "Lady Liberty" AoS - Congress immediately comes to mind). Sooner or later, probably somewhere in the early '70s or so, someone there must have come up with the idea of making a corporate identity, and that starts with unification and simplification of anything that's identified with your company. People felt that was the more modern way to handle corporate branding, and still do today - Starbucks made their logo simpler, and Nike is more recognized today for their "swoosh" logo than the actual word "NIKE" in print.
Bee remained basically unchanged probably because of the demands of the casino business for keeping things familiar to their customers, while Tally-Ho and Maverick, considered regional brands, were also left essentially unchanged in design to appeal to those customers using it in their respective regions (Maverick - southern US states, maybe out west as well; Tally-Ho - New York City tri-state area). I imagine that the Aviator brand box, AoS and Joker have changed significantly - you'd never know from the modern "jet" design features that the brand was created to commemorate Charles Lindbergh's trans-Atlantic flight in the '20s.
OK, end of rambling, go about your business. Move along, move along...