*While some countries have vastly cheaper data. Some do not and also if you go to lots of destinations the “starter park” / SIM card cost can outweigh the cost difference easily. Which is why it easily made sense to me.

Also saves you trying to find one at the airport (strangely not always possible) and also gives you coverage when at transit airports (flying from Australia to varios destinations I almost always have a few hours transit somewhere in the middle)

If you’re in a country with easily accessible cheaper data for long enough (eg the UK has really cheap travel sims) you could always switch for that trip.