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Not quite sure abou what you mean on most casinos being not optimized on mobile devices. So far, I've visited tons of casino especially those that have introduced here and most of them are quite adaptive and capable on mobile devices whether it's android or apple devices.
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Apart from additional games and bet flexibility, I don't think much could be updated with the current development that modern gambling have.
I tried some casinos which just being same version of their website even on a smaller screen that is what I am talking about but yes the upcoming casinos might adapt it while still not all that is why I said it can be one of the suggestions when it comes to development.
There is always room for development and that is what evolution taught us. Anyone who wants to stay in the business needs to keep updating themselves to new generation technology, games, user experience and a lot more which will keep the users stay on their platform it is very important nowadays cause you can witness the competition on the crypto casino market is getting wild over the years compared to 2017 market run.