- I don't yet understand why steps x, y, z are necessary. To me it would seem simply/naively doing ... might work but I'm probably missing something.
- Would an (objectively) simpler (though possibly not perfect) solution (which I'm just putting on the table here) suffice here?
- I think we can do ... here and it'll be fine. Should we / let's see if that works, and revisit ? / .
Sure, "just do it" would often be bad, indicating a variety of things like "stop dwelling on this or arguing, do what I say". Or "can you just quickly do this (thing I find trivial but don't understand at all) for me", but in the end it's the context that matters.
Like, I can turn this around as well. The word "don't" is negative and should be avoided at all cost. Better: "could we try ... instead of ..." (see submission title).
Then conclude "don't worry about it" should not be said. Which to be fair is also true in some contexts but again, context!
EDIT: To be clear it is valuable for me to learn that usage of "just" could be problematic. That's important when not knowing the other party but among coworkers I also happen to have more of a relationship with than just one-off comments, these kind of word choices are not what make or break things. Especially in a diverse environment I assume everyone is acting in good faith and I would only let word choices affect me if the sum of my interactions with a coworker has been negative already and I "know" they are trying to incite an argument.