Unlike Android indeed, when you maintain a perfectly working phone that happens (by accident or force of nature) to live longer than the official lifetime some executives in a remote office had decided to grant it, the web browser cannot be updated any more. Just the single most security sensitive piece of software of any computer. Who would have guessed people were going to complain!
And neither does Google. The latest version of Chrome requires the version of Android released in 2019. The latest version of iOS supports my iPad released in 2019.