Earlier quoted context omitted.
So it's not about what's best for the user but what's best for Apple? I wouldn't call that "understandable". All this is doing is contributing to webkit monoculture.
There's some irony that Apple forcing the use of Safari on iOS is creating a monoculture when, were the restriction lifted, everyone would be using Chrome.
I'd be amazed if there were more than a tiny fraction of iOS/iPadOS users (of which there are hundreds of millions) who weren't perfectly ok with Mobile Safari for their everyday usage.
[I'm probably the "target market" for Chrome (backend, occasionally frontend developer) and there's no way I'd have it on my phone. I only suffer the GMail app because they've made IMAP usage of gmail unreliable.]