It's crazy isn't it @strawberrybubblegum . It should be based on need, not whether you became ill before or after Labour came to power. They need to ditch this bill and go back to the drawing board.
I grind my teeth every time one of the ministers starts banging on about getting people back to work. PiP is a non-means tested, in-work benefit. There is no disincentive to try work, because you don't lose PIP if you work!
There is also a worry about those who have fluctuating conditions. If they lose PIP for a while, but then need to re-claim it if their health deteriorates again, they will be assessed under the new criteria. Many will no longer qualify so the government will still get their wish.