Ethan Siegel tells us, the Big Bang is too simple:
The 20th century brought us General Relativity, quantum physics, and the Big Bang, all accompanied by spectacular observational and experimental successes. These frameworks enabled us to make theoretical predictions that we then went out and tested, and they passed with flying colors while the alternatives fell away. But — at least for the Big Bang — it left some unexplained problems that required us to go farther. When we did, we found an uncomfortable conclusion that we’re still reckoning with today: any information about the beginning of the Universe is no longer contained within our observable cosmos. Here’s the disconcerting story…
It’s one of the most remarkable achievements of science of all: that we can go back billions of years in time and understand when and how our Universe, as we know it, came to be this way. But like many adventures, revealing those answers has only raised more questions. The puzzles that have arisen this time, however, may truly never be solved. If that information is no longer present in our Universe, it will take a revolution to solve the greatest puzzle of all: where did all this come from?Ethan Siegel, “How Physics Erases The Beginning Of The Universe” at Forbes
We don’t doubt that 2 + 2 = 4 can be dissolved in like manner, as long as the needed incentive is present. And it’s no secret that a great many cosmologists hate the Big Bang for philosophical reasons.
See also: The Big Bang: Put simply,the facts are wrong.