@kitten because kids nowadays find "looking out the window or listening to music or reading a book" not as exciting as "having a mental breakdown over bad mobile internet reception"
@kitten@mbr speaking for Germany, here the trains have way better hardware for antennas, and use MIMO to aggregate multiple gigabits over like a dozen of (e)sim cards with contracts from each of the three big cellular data providers
so if you just used your phone with subscription to one provider you'd never get the same bandwidth, and if many people are in one wifi they're also less likely to congest channels for everyone else