I've been using iOS since the iPhone 3G and have built apps for it. I know iOS inside out. I recently started a new job where the vast majority of our customers use Android. I therefore chose my work phone to be Android, so I could use the same platform that our customers use.
Wow - is it confusing! Nothing is intuitive, and I genuinely find it very hard to use and get into a rhythm with. It's a Galaxy S9, so hardly a "bad" Android phone.
My takeaway is that so much of the way we use our devices, especially our phones, becomes muscle memory. Android is not badly designed, neither is iOS, it's just that I've built up a decade's worth of muscle memory, coming from hundreds of interactions a day with the device, that switching to a different paradigm is going to feel jarring.