Post History

If it is possible that someone who isn't a developer of that software (or such software) can objectively answer the question, then I think it would be on-topic. 

If answers involve speculation about the developer's rationale or in case there are no sources to be found explaining why the software was designed in a certain way, then I don't think it is suitable for any Codidact site.

Questions asking why a certain feature is missing from software seems kind of impossible to answer without speculation. The question you refer to is just like that. Another example: "Why doesn't MS Teams have a push-to-talk button? All gamer VoIP software have this since some 20 years back."  It's a reasonable question to ask, but can only be answered by Microsoft, so it is a bad fit for any Q&A site. 

Also such questions are easily "rant in disguise" - my example above could be just that. I could as well have asked "Are the designers of this product ******, have they truly never experienced open mic, have they never used computers before, why didn't they look at existing software before releasing this ****?". Which isn't very nice, it likely violates our Code of Conduct, but fills the very same purpose - ranting. And the poster isn't really expecting any sensible answer, they just want to vent their frustration or badmouth a certain product.