I do agree w/ your assessment on the 'lack' of progress. However, as I've often mentioned, I think this is partly 'our' fault. The collectors, or the market, would put a premium whenever we have some models w/ strict lineage to the history. (Ok, this is MOSTLY true with exceptions) While a lot of the innovations, in typical horological sense, would go relatively unappreciated.
So we've been sending the signals to OP that WE generally don't appreciate ground breaking innovations or daring new style. We just want those historical pieces that remind us of watches from the 40's. And guess what the answer is? Naturally the remake of past successful models.
No doubt they're still developing 'new' complication slowly to appeal to broader audience but I think OP has essentially answered to the 'core' collectors group most of the time. What do you think?