When’s the last time you saw an engineer doing tensor calculus? And that said, whomever said Einstein wasn’t good at math has also never done tensor calculus.
People mean different things when they say maths. To most, maths means calculating things using numbers. Engineering absolutely has more of that than physics. But there's so much more maths out there than the average person even knows about, like your example. Physics has more higher mathematics, and engineering has more calculating stuff using numbers.