Ill throw in my two Cents, but I'm no expert.
Lumpy... I think it depends on the TYPE of hunting you do, WHERE you live, and what you WANT from a dog.
Im from Nevada, Chukar capital of the US. It is hot early season here. Labs were originally bred for cold weather, so they have thick coats and get hot easily. Not many people use labs for upland hunting here unless they are kept at heal and used for retrieving downed birds because they get too hot here. I have trouble keeping my setter cool, and my friends GSPs too.
Chukar hunting is intense up steep hills and in the desert, would not recommended a lab. but grouse, quail, pheasant all would be good for labs. Cooler places would be better for a labs.
There are other all around dogs that do everything point, and waterfowl: wirehairs, Brittanys, springs etc.