Have you been to Switzerland? Their public transport system is a mix of busses/short trams and long trip trains. They aren't precisely a high density urban country. They have suburban sectors. The difference here is that they don't make walking a punishment. You can count that everywhere you want to go there's a walking path, even when going off-road. Yes, it's not 100%, but it doesn't need to be. If you can reach 70% of all the places you will ever want to go using public transport, that is enough.