It's not even sort of the beginning. The conservative stance on the role of the Supreme Court has been pretty clear for a long time and this court has been ruling that way for a few years now.
Their theory is that Congress makes the laws, the Executive branch enforces them, and the Judicial branch interprets. The precedent that they've overturned has consistently been in line with this logic: they've said over and over again that if America wants a law then Congress should create it, rather than relying on executive rulemaking that gets overturned every time an administration changes or on unelected judges legislating from the bench.
Whether or not you agree with them on specific issues, I think we can all agree that the current status quo where worker rights take dramatic swings every time a new party takes control of the presidency is a ridiculous situation that needs to be fixed. I want a nation of laws, not a nation of administrative rules that have a 4-year shelf life.