> Vegetables grown in the Netherlands tend to taste very bland in my experience (personal taste)

I see this raised often. It's almost exclusively because the cultivars used are specifically chosen for yield and hardiness in transport and storage. The "organic" stuff grown in a farm 20km away and only needs to be transported for half an hour, on the other hand, are just cultivars that can be selected for reasons other than hardiness. This type of cultivar can also be mass-produced although it becomes a lot more expensive for the producer and the customer.