I'd wager it's harder for the HN audience. They'd have many more services they need to update account info with, or apps they'll need to find parallels for.

Most regular users use a small number of services (Facebook, reddit, whatever) and that will be available across both platforms.

Something like exporting email from one account to another will be more difficult for the regular user, but there's many guides available online. Or more realistically, a nephew to do it for them.

In fact I’d wager that a substantial number of regular people would move between iPhone and android without ever realising that they were convenience benefits in sticking with the same platform, other than basic familiarity with a particular user interface.

Similarly, I’m sure there are plenty of people who continue going to a McDonald’s drive-thru instead of a competitors’ because they are comfortable with and familiar with the menu. Yeah no one would accuse McDonald of having any amount of “platform” lock in.