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Anyone who's watched https://www.youtube.com/user/TheChieftainWoT can attest that most WW2, early postwar and most Soviet tanks were ridiculously crowded affairs that must have impact crew performance and fatigue.
So, let's make a tank to replace the Sherman for use by the USA and under lend-lease to Britain. Focus starts with the crew space, meaning ease of use and fatigue reduction. This means there's plenty of space for everyone to do their jobs, and systems that make that job easier, such as driving, etc.