Whilst I agree with you in sentiment, in practice you can achieve a ridiculous amount in engineering without complex math (i.e. anything more than basic ohms law and other basic level stuff).
The Maths Faculty member who taught me 2nd year engineering maths summarised that succinctly while still hinting at the the underlying truth. "The best result of maths is that you don't need to use it all the time".
Engineering is an applied science, and you can often understand and apply engineering principles to give you (even complex) desired end result without much math at all.
Iff, importantly, you stay within the limits of where the maths is valid. To know that boundary needs an understanding of the maths. Similar principles are true in many engineering domains.
(Iff is the math's contraction of "if and only if").