Why is the fruit from supermarkets usually so shyte? What has been done to it?

Every pineapple I've had hasn't even been that sweet, soft or juicy - more whitish pale looking inside than rich yellow/orange, the label states that once picked pineapple doesn't ripen any further so it's nothing I'm doing.

Bags of small oranges or 'easy peelers' as they are labelled are usually shyte - either dry or tasteless.

Pears used to be soft and juicy if left to ripen but now either seem hard with little juice or turn to rubbery mush.

I bet if some small scale independent farmer local guy in Costa Rica gave me a Pineapple it would taste totally different, honestly getting to the stage where I don't trust half the food sold in supermarkets.