I don't believe they do(Haven't see it), so if they really don't, they really need to implement it. And explain the reasons for the changes in detail, so maybe more people will understand the update and not go too frantic over it.
Mmm, I see that does look really close to a changelog. My only question is, why the devforum? Not many roblox players browse it, it should be somewhere on the website itself imo