If you think it was good, it probably was - all I remember about traditional kindergarten was hating it.
That said, they apparently voiced strong disapproval of the fact that I could already read, so it's not something I could actually recommend. It probably just didn't come through to the small me.
Strange, I had the same experience in a public kindergarten. I never understood that attitude. I could read at a 5th grade level in kindergarten, but that was treated as an evil thing by the teachers because the material they were trying to teach was far below me. I suppose I can understand that in retrospect now that I think about it though, it must be frustrating to have a kindergartener who doesn't bother listening to a teacher teaching the alphabet, but doesn't even know how to tie their shoes so there's no possible way they could be skipped ahead.
So, their disapproval is not strange at all, it's completely consistent with their view, which is that teaching children younger than 7 about abstract things like reading is harmful.
What is strange is that Waldorf is still a thing. I strongly suspect that a large number of people sending their children to these schools would've never done so, if they were introduced to the theory behind them in detail beforehand. It's certainly not the place to send a child, if you dislike the cookie cutter approach of public school systems, as Waldorf schools are even worse in that respect.
I can, however, understand where your condescending attitude comes from. I used to wonder why churches and clerics were still a thing. Until someone from my family ended up in the local church council, and it sort of dawned on me, that actually, you do not need science to do a lot of things right. You can come from a down-right anti-scientific base and still be more skilled - scientifically better - at something than someone who doesn't believe in anything but quantum mechanics.
Waldorf education has turned Steiner's ideas into an ideology and the movement is unable to reflect on what it's doing, why and that it might be wrong. This creates a culture that, just like religion, is fixed and cannot change without conflict.
Science doesn't have that problem, the culture around it embraces change and improvement. An education policy that truly takes advantage of that, will eventually lead to institutions that outperform alternative ones like Waldorf schools.