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Stop/Start is marketing crap - the small amount of fuel savings will be more then offset by wear on other costly components. You may save a few cents now and pay a lot of dollars later. In Australia we don't have Stop/Start on the RX (NX has it)
We have an Australian RX 300 2019 model and it does have stop start which works very smoothly but I don't use it much because I agree that it's a waste of time and I prefer to keep my engine running.