Could robots learn the complex task of picking blackberries?

The long-running series in which readers answer other readers’ questions on subjects ranging from trivial flights of fancy to profound scientific conceptsI was out picking blackberries from the hedgerows recently and thought the complexity of the task – a very gentle squeeze to establish the degree of ripeness, together with a visual assessment of the degree of swelling and a bit of tugging or twisting (but not too hard so as to squash it) – would be beyond a robot. But is that