We should reopen this. It's just as constructive as any other feature request.
Wrongly closed (or wrongly open!) questions, on main or meta, are broken windows that mislead the whole community about what sorts of questions should and should not be closed. So even though this question is old, it's worth reopening.
While that meta question should never have been closed, the wording was harder to understand before izx's edit (which happened before the question was closed but probably after a few of the close votes). Maybe that's why people voted to close it.
If you agree we should reopen it (and have something to add), or disagree and believe it should remain closed, or can explain what standards would justify closing that question without also closing the vast majority of discussion and feature-request questions on meta, please post an answer here!
Finally, a reminder relevant to the status of that meta question: It's considerably harder for a question to be not constructive on meta than to be not constructive on main. (Though it can happen.) On main, discussion is discouraged, and a question that calls for opinions is usually not constructive. In contrast, as the meta FAQ says:
This site is for meta discussion about askubuntu.com.