Neither of those terms were developed by suits. They both were popularized in the Gen Z social sphere, namely TikTok, and then well after they went viral and had plenty of adherents, started being picked up in the normal media cycle of regurgitating whatever is happening on social media and seeing what sticks.
They’re both just a rejection of “old” cultural norms, in this case specifically a rejection of “hustle culture” and to a lesser extent the FIRE (i.e. early retirement) movement, both of which had their heyday on the internet many years ago.
And like…this shouldn’t be a surprise to anyone. Gen Z is typically much more concerned about mental health (focus on now) than prior generations, has a very doom and gloom outlook for the future (focus on now), and is the first generation to be raised by people who didn’t tell them “just work hard and you’ll be fine eventually” (focus on now). Is it any surprise that they’re less forward looking? What do they have to look forward to? Call it cyanide if you want, but while I don’t necessarily agree with it, it certainly feels like a natural development to me.