The nets are much more successful in capturing all sorts of birds at once, with little effort, even in environments where you wouldn't get clear line of sight for photos and/or for species that don't sit still for long enough.

Handling the birds makes for far better identification (and more detailed pictures too), which is important for places where unknown, hard to identify or hard to detect species are likely to exist. It also allows taking measurements, banding the birds and even collecting tissue samples. So nets are a far better ROI for some scientific projects.

I guess we have to be a little suspicious these days about image provenance but yall sound paranoid. A couple of famous ornithologists are going to take a 6-week expedition and then trash their careers by using DALL-E? If the grip looks weird to you, look at "The Mist Netter’s Bird Safety Handbook".

>> The leg hold, or photographer's grip (below), is used to hold birds while photographing them since it maximizes the amount of plumage in view; to transfer them from one bander's hand to another; or to examine features. For this hold, you "scissor" grip the bird's tibia between the fore and middle fingers (or between the ring and middle fingers if your hand is very small) and then clamp the bird's tarsometatarsi between your thumb and fore (or middle) finger. In this hold, the bird is securely gripped above and below the metatarsal joint, which is bent into an "L" shape. The bird will be able to flap its wings and rock backwards and forwards, but it should not be able to rock from side to side. Never hold a bird by the ends of its legs alone — they will break! Place your free hand over the bird's back to keep its wings from flapping until the photographer is ready to shoot.

https://www.birdpop.org/docs/pubs/Smith_et_al_1997_Mist_Nett... (page 25)