Rational: Read Yaakov Elman’s works. Then realize that you’re saying just like him. And realize that he has almost definitely crossed the border into Apikorsus.
It is not an Ikkar Emunah to say that Chazal knew all of science. It is, however, an Ikkar Emunah that all Dinim remain the same L’olam Va’ed (until we have a Sanhedrin that can argue on Chazal). Because, among other things, you just pragmatically no longer have a Halachic system when anything or even everything can be disregarded as “no longer relevant”.