You can use me as the example then because I do it. During the summer, I sunbathe topless on my deck all the time. I'm not jumping up and down waving my arms to get my neighbors' attention, but I don't hesitate to walk back and forth to the house or to the edge of the deck to call the dog in without a shirt on. Sometimes I even pick up the hose and water the plants before coming in. So I guess, technically, I'm gardening topless. I really don't care if the neighbors catch a glimpse of anything. As far as I'm concerned, being on my property is discretion enough.
It could also be said that a person living in a society where babies and nursing mothers are present should expect to see breastfeeding. If people don't want to see that, they shouldn't go out in public.
***
I was seated next to a breastfeeding mother on a Disney bus once. The only reason I even noticed was because of the way she kept nervously looking around like she was worried someone would make a scene about it. When we got off the bus, I said something to my boyfriend about what a shame it was that she should be so uncomfortable to breastfeed because society at large has decided to turn a perfectly normal process into a debate. My boyfriend said, "Is that what she was doing? I couldn't tell." In other words, even when he thought she might be breastfeeding and was sitting right across from her, he couldn't be sure that's what was going on. And yet, I'm sure there are people who would argue that a crowded Disney bus full of kids is not a discreet enough place to breastfeed. Which is why it is completely worthless to argue that breastfeeding should be done discreetly. It's too subjective and there would never be an agreement. (For the record, I would've been fine with that woman stripping completely naked to breastfeed, so long as it meant I didn't have to hear a shrieking infant all the way to the Magic Kingdom.)