My hotter take: All 3 of the engineer, PM and designer will all assume the other 2 are optional, in reality all 3 and the entire company they work for will be optional in most cases.

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operatingthetan 10 hours ago | parent | next [-]

You just need one of them. It's probably the engineer.

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badgersnake 9 hours ago | parent | prev [-]

Good PMs are not optional. Most PMs are.

	▲	lelanthran 9 hours ago \| parent [-]
		How are you defining optional? Companies without any product managers, much less good ones, are putting out profitable products all the time.