[watwut]

I don't like your alternatives, because they are not the same thing. They also use too many words and assume you have mythical improvement.

But also, "this is dumb" is insulting. It is not direct, it it's just insult with 0 information.

"This won't work" or "this will cause issues" or "this is complicated" would be better equivalents, because they actuality hint to what your issue is and wont insult. The management, if it listens and have good reasons is then fully able to modify their own plan or stick with it while noting objections. They are also fully able to explain why they are doing it is objection seem to miss the mark.