To stay "it was a disaster" isn't specifying what issues you had, so we can't really answer whether those have been solved or not. What issues did you have?
The SolusOS developers are doing their own thing. The Linux Mint developers cooperate with developers from various other distros though, but that wasn't your question
But let's stay on topic about LMDE in this forum. If you want to talk about other distros please do so in the "Chat about Linux & Other Distributions" forum.