It's true there is a bus to Marin every 20min but it uses a _single_ fixed route. People that live far away (>1km) from this path spend less time driving to Pontevedra than walking to the nearest bus stop.
It is not just increasing frequency, it is a matter of providing alternative routes to serve an important part of the population.
1 km or 5 km in north Spain’s weather is a cycling first range. Electric bicycle would save those people a ton of money and time compared to cars. Netherlands considers 7.5 km radius a catchment range of a train station in non-urban setting.
It is not just increasing frequency, it is a matter of providing alternative routes to serve an important part of the population.