Most breeders and nearly all pet store clip babies - the better ones at least let them learn to fly a little first.
It's not strictly the breeder being lazy or uncaring, a lot of it is more misinformation. A lot of resources, even many vets, will say that clipping is essential for safety, so some will clip for this reason. A fledging baby will also be more interested in flying around than in eating and will lose weight - while this is normal, it can be worrisome to the person feeding which may be why they think they need to clip.
If it's a fairly light clip, he will be just fine. Encourage wing flapping and let him fly after his molt and he should be ok and learn to fly pretty well, if not quite as well as a wild bird. Clipping is a more serious issue when a bird is clipped severely (so they can fall and become injured and damage growing bloodfeathers), or when they are clipped for years and start to lose muscle tone in the wings. Another option, if he turns out to be clipped too severely, is to have several of the cut feathers pulled, so he regrows them quickly, but this should only be done by a vet and only if hes at risk of injury.
Also IMO, a light clip when a bird's going to a new home isn't that bad. It can help keep a bird safe while they learn about their new home. Case in point, when I brought Sammy home, clipped, he liked to be put on the windowsill but would sometimes try to walk through the window. As in, face the window and just try to walk through it, feet sliding on the windowsill. As a baby, he had no concept of it being something he couldn't go through. I worried a bit about how he'd be flying - but by the time he could fly, he was fine with windows. He was an amazingly agile and graceful flier and never hit a window.