I think millennials and zoomer are just being open and honest about things that always happened. We love labels and with the Internet talks with other like-minded people. There have always been people who worked 9 to 5 at a job and prioritized stability over money. We are being open and bragging about it. We just want to break the hustle culture that was always a loud subset
For example my dad a peak boomer worked at the same company for his whole career and turned down "promotions" that gave a manager title with little more money. They have always been there