Metric is vastly easier, and fully as precise as our system. But if you grew up on our system, the transition is painful. The worst situation is a helter skelter mix of the two, which is what we have in the US.
So, is it a good idea to have engineers who can only work with the "vastly easier" system designing aircraft and bridges?
Working with a slide rule can be tedious, but do we want people who don't have the capacity to deal with a slide rule designing spacecraft?
Digital calculators make arithmetic problems simple and easy, but do we want people who never develop enough number sense to solve 297^2 / 17^3 using a pencil and paper designing nuclear reactors?
