agile – Why was SAFe considered necessary?

What did the creators of SAFe deem inadequate about existing agile ideas that lead to the creation of SAFe?

In my world I meet people who consider SAFe to be an obvious and normal improvement. I also meet people who consider it to be the end of agile and productivity. Neither ever goes into what it’s intended value is.

To be extra clear, I’m more interested in what SAFe’s claims are than in debating whether they’re reasonable.