Because any competent engineer should be able to work with both interchangeably.
I.e, all you've given us is a reason to only ever use SI. Which isn't really what your intention was, was it?
(I'm aware non SI is useful in some contexts.)
I used to be a physicist so voodoo around constants so that we end up mass having energy units was common but I cannot think off my head of problems better where imperial units are easier. There are certainly, I am genuinely curious which.
Now I know what imperial units are useful for, thanks.