I describe its weakest elements as design cowardice. A palpable, almost despicable timidity to make anything "too powerful", which more often than not kneecaps class design & creates huge gulfs in quality and level of creativity between most core options & classes/features designed w/ low-cowardice.
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Cleric is an insurmountable healer. No other class comes close to touching Divine Font.
The one I'm actually kinda mad about is Focus Points. A fantastic hook to hang all kinds of design on, almost never used to its potential.
I’m sure the system is wonderful to write for, but its constraints sometimes feel arbitrary outside of that mindset.