I never tried it so I can’t tell you for sure. But I think if you don’t mind waking up your console using its power button and you don’t use the C function, you won’t miss a lot not upgrading. That’s what I’m doing.
It’s SO comfortable, the plastics just feel very noticeably nicer. It’s not essential of course but the extra features like back buttons, ability to wake the system and including a speaker is worth the upgrade in my opinion
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But again, I never tried the new controller.