“Do all (or at least most) Jews accept this as authoritative, equal to the Torah itself?”
You cannot observe any of the major Holy Days without the Oral Law.
After going through pretty much all the Jewish movements, I feel confident in saying that it’s up to the individual to perform mitzvot. Getting rid of the Oral Law completely would require reinventing the wheel all over again (yes, I know there are movements that want to do this).
Children must be raised with a Jewish education, or you’re depriving them of a happy life where they know how to make good decisions.
Watch “Srugim” on Amazon Prime if you have it.
Thank you all for your replies much to read and view, which is good for learning sake.