That's not the case. The bugreport that they closed is still actual in the latest version.
This is not a case of it's fixed in x, or you should upgrade to y, it is neglect plain and simple.
I asked about this exact issue when they did an AMA in the SQL Server subreddit a while back, and I shit you not the response was that 'for a few years the team didn't have a lot of resources'... That's right, MS doesn't have the resources to properly support and develop SQL Server and the surrounding development tools.
They were also encouraging everyone to vote on the connect items, as they were using vote count as the priority indicator for addressing issues. No intake triage, just get enough votes and maybe then they'll think about fixing some bugs.
I simply don't use their tools any more where I can avoid it, and where I can't I'm looking for longer term replacement plans.
This is an admission that they probably never gave a damn about your bug reports. But hey: if you'd like to help this multibillion dollar company to triage their bugs and re-file an updated issue they would appreciate it.
In reality, it's not that easy. There have been times where, in projects that I have been involved, I wanted to fix a certain issue but the time required to setup, reproduce, investigate, fix and test against that and other versions, just adds up to a point where you cannot focus on the other equally important (new development) tasks at hand. So overtime, issues which might look easy to fix or interesting, do get piled up.
And that's not the case again. I already provided all information to reproduce that bug easily.
PS "bugs", actually. They've closed several bugs that I reported, though notified me about one only.
What means that somebody got them into the unmanageable state, in the first place.
There are active bug reports and feature suggestions for SQL Server that are more than a decade old.