This was largely discussed here: (Most-Wanted) Features.
I am closing the thread. The short answer is “we see the need of the feature, but it’s incredibly hard and we haven’t spent much time solving it.” 
This was largely discussed here: (Most-Wanted) Features.
I am closing the thread. The short answer is “we see the need of the feature, but it’s incredibly hard and we haven’t spent much time solving it.”