Do they all taste the same?

I've been "thinking" - and I blame you and your mixed up tomato seeds. If all courgettes, say, taste the same, I may as well mix them up and sow them as "unknown" courgettes. It really only matters if I want to save seeds (and I wouldn't save courgette seeds anyhow) or, if one plant does particularly well and I'd like to grow it again./or badly and don't!
I'm always tempted by packets of mixed varieties (like Morton's Mix Lettuce) so I think I'll make up my own Mixes.
Courgettes, Leeks, Lettuce, Chard and some Kale.

Adding Radishes to the list1