I said to the general public, and I would be correct.
Step outside your personal experience. It was about the toys, before and after
to you. The majority of the world, however, had a different experience.
Millions and millions of children (and, as Scott M points out, those older as well) who watched the show every week day. Far more than ever bought or cared about toys.
Yes, we
all know the toys came first. But the general public doesn't see it that way. It's more of a trivia question or factoid than anything else. The majority of people have as their first, and most lasting, impression from the Filmation show.
Here's a test : type a MOTU word into Google Search - to make it really visual, search Google images. Type "He-man" or "She-ra" or something similar. You will see 10:1 (a conservative estimate) that what material is out there, what people remember, etc. is almost all Filmation.
Yes, this site skews a bit differently. But it's hardly a representation of the public at large. When you mention He-man or She-ra to most people, they recall "I HAVE THE POWER!" or the transformation sequences, or that they always loved Orko, or many other things that are from the Filmation show. And then it's, "oh yeah, weren't there toys, too?"
This is not to be dismissive of their importance in MOTU history, but simply the reality of how MOTU is remembered today by the general public - which isn't even as MOTU, but "He-man", or "He-man and She-ra".
Here's a non-MOTU example. "The Wizard of Oz". A series of successful books that came before it, but what is really remembered? The movie. And what is the most iconic thing, the thing that people bring to their mind first when the words "Wizard of Oz" are spoken? The Ruby Slippers.
And you know what? The Ruby Slippers were the invention of the film. In the books, they are silver. They wanted to show off the Technicolor, so they picked Ruby Red (incidentally, this is why even though the books are in public domain - anyone can write an Oz book at this point - certain elements, like the Ruby Slippers, remain out of bounds as they are property of the rights holders to the film).
It's much the same here (not exactly, but it is an apt comparison). The most successful, by far, aspect of the Wizard of Oz franchise was, is, and likely always will be, the film. Even though you can go to dozens of websites and talk all about the dozens of novels that followed (some by Baum, some by others - some people even write them today because of the public domain thing). You even have "Wicked" and that stuff - but still, in the end, the movie was seen by far more people than have ever picked up an Oz book or seen the Wicked musical.
Just like He-man/MOTU = Filmation to the vast majority of the public.