Only two windscreen wiper speeds? (Corsa F, 2024)

My car has automatic windscreen wipers but I found they are untrustworthy, e.g on the motorway when it was pouring with rain, there was spray everywhere and a lorry goes past. Most of the time they would be on maximum speed - but not always, which was dangerous.

However, it appears there are only two manual windscreen wiper speeds - slow and fast.

That is fine for drizzling and torrential rain but there is nothing in the middle.

I have never driven a car with only two manual windscreen wiper speeds before. Seems daft, to me.