What are the differences between this question:
Should there be a regulatory body to regulate the number of developers graduating every year? [closed]
And this question:
What were the reasons why Windows never had a decent shell?
The first was closed by Mark Trapp after he commented that Programmers isn't a discussion board. The second has active speculative answers that seem to me to simply be discussions and opinions about the question. Disregarding the quality of the question (the closed one could have been closed simply on that merit) what makes the Shell question worthy of continued discussion?