It's possible to be critical without being harsh or uncivil. e.g. your example can be shortened to "X is bad, Y doesn't work. We already have Z." And the opini

It's possible to be critical without being harsh or uncivil. e.g. your example can be shortened to "X is bad, Y doesn't work. We already have Z." And the opinion "bad" could be replaced with its factual/reasoned basis. Of course, praise is sweet and criticism bitter. Let's not sugar-coat it - but let us not poison it either.