Theories - or what is old is new again

In preparation for a class I was teaching, I revisited my home library of public administration books from:  classes I took myself;  classes I taught; and books I just decided to purchase. Many of them contain sections about the various commonly accepted theories in public administration. Names like Weber, Taylor, Waldo, Gulick etc for those that know. What amazes me is that, in 2025, we have some revisiting of elements of these theories on full display. Take New Public Management, originally popularized in the late 1970s, early 1980s. “Run government like a business” and the application of private sector principles to public sector operations were common elements. Are we not experiencing a revival of the NPM movement on full display via Musk and the efforts of DOGE?  There are also elements, on display from the Federal to the Local government, of the Public Value Theory (Moore), from the 90s - with its focus on creating value and citizen satisfaction. Perhaps we are seeing what is old is new again?