I agree with your premise that speed makes a difference and should not be ignored, but your conclusion about android seems a bit off.

The pixel 4 is older and much more of a budget device compared to the iphone 12, I am not sure why you are comparing the two.

That being said, my even older oneplus 6t takes around 200ms to open Firefox so I am not sure what is wrong with your pixel 4. Same on my partner's pixel 4a (which should be even slower).