For a decent-sized constituency, the barrier is exactly the same: they haven't got admin rights, and the IT department installed/mandates the version they have.

For a decent-sized constituency, the barrier is exactly the same: they haven't got admin rights, and the IT department installed/mandates the version they have. And for another too: the large proportion of people who have no idea what either an OS or a browser is. It's a mistake to imagine that everyone (and perhaps even a majority) either understands or has control of their computing.