My experience is coming at this more from a politics/social-issues perspective. Where problem-solving is obviously a lot more subjective, value-laden, and controversial than with tech issues.
So often, people (including mods) will interpret “constructive” not in terms of personal conduct on the forum, but of a political or activism goal. IE ideas and opinions do not align with their preferred ideological framing, they are dismissed as societally non-constructive.
It happens! I have left two different Discourse-based fora as a consequence of this.