in the hoverboard documentation say “Note: In order to ber compatible with encoder inputs, the ODrive doesn’t have any filtering capacitors on the pins where the hall sensors connect. Therefore to get a reliable hall signal, it is recommended that you add some filter capacitors to these pins. You can see instructions here” my question is if it is recommended or necessary?

From personal experience you won’t damage your board or be unable to run the motors without the capacitors.
It’s recommended, but I’ve always ended up adding them.
I would try doing whatever you’re doing without them, then decide if the results are acceptable.

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