If you;re making soup properly then the first thing you do is fry off any onions and vegetables which creates the deepr caramelised flavours. For example for parsnip soup you might first fry off (saute) some onions, garlic, celery and some spices.
If I make butternut squash soup then I first fry off onions, garlic, celery, potatoes and the squash so it’s a little browned.
I’m guessing all you’re doing with the machine is just boiling veg in water which is quite a bland way of cooking TBH.
It’s all about the flavour and in soups that comes from the sauteing the ingredients.
Realist, The soup maker, l bought and took back came with a sauté option. l agree, it’s the sautéing that gives the soup the flavour.
Do you ever use a pressure cooker to make your soups? They are ready in 15-20 minutes and all the goodness is kept inside whilst it’s cooking the food.