Pretty much sums it up: http://h3.gd/devlog/?p=22 D1 and D2 are like different languages. D1 went to a dead end and D2 got nowhere, it got into a conundrum feedback loop. It's a bit hard to explain everything in this post since there is a lot to cover, but most of the community that is years into this is aware of all of it.

Also, good luck with any kind of support that is not in the interest/hobby of D developer. I once wrote a fairly large program that was for a commercial purpose (wrote as an order) - and I got stuck on a fairly large bug in standard library which I couldn't resolve myself because I have lacked the expertise to do so, I even think it was not open sourced then also (basically free() never returned memory to the OS). That bug is still open after several years. I offered money, anything basically to get this resolved since my application crashed due to it - if there weren't for helpful Tango guys I would have to rewrite the damn thing from scratch in another language.

D1/Tango had so much potential, but it got nowhere, unfortunately. I am still bitter I spent so much time and effort in D at all, just to return to C (and some C++).