One factor to consider is that not everyone can wrap their knits in a towel and tread them to remove the excess water. I am sometimes unwell, and at those times I’m disabled to the point that I can’t do this. Luckily I usually feel better after a few weeks and washing can usually wait.
But some people need to rely on a machine wash. Hopefully washing a swatch a few times will reveal whether a garment can be machine washed safely.
O a different note, I remember being told is that a short, high spin is better for woollies. My Miele uses a high spin on the wool cycle. I think it is because a lower-speed spin can allow the item to stretch, but it’s been a long time since I studied physics, so maybe someone else could chime in on that topic!