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> I can't even type a simple expression with parenthesis

Use Scientific mode and parentheses work fine

Work "fine" but not quite "great". Made a mistake? Retype the whole expression, as there's no backspace / undo even before hitting =

It sounds like they made the behaviour imitate that of a bad scientific calculator.

I've not used a physical for some years, but even then the Casio ones had a backspace, and had apparently done so for a good few generations.