You should withhold judgement until you see the total ergonomic impact. Maybe having extra rings on the lens barrel would require the shooter to have a third arm to pull focus. If you want a first AC at your side the rest of your life, buy the model with interchangeable lenses.
Of course I'm sure they'd scrap it in a minute and put Scarlet back in the development cycle for another year or two if enough people squawk. Is this issue a deal-breaker for you or are you willing to adapt?