Our deprecation and support policy changed dramatically in the 1.0 release, from a monthly cycle to a six-month cycle. We changed to a three month cycle in 2.0

Our deprecation and support policy changed dramatically in the 1.0 release, from a monthly cycle to a six-month cycle. We changed to a three month cycle in 2.0 because of direct feedback from HLL developers that three months was way too long. I don't know what you mean by "change the toolchain".