You are right. You can't compare the taste of a freshly picked mushroom with the ones in the supermarket. We can't be experts in everything, I, for example, am not an expert in anything... and I don't mind. If you know mushrooms well and can eat them without worry I think that's enough. I know 2-3 mushrooms and if I had to go mushroom picking, I would ignore all the others.

I'm impressed by the beauty of the landscape where you live, @andyjaypowell, is great for the walk. Sorry for the late reply!