Yes, but people work on what they choose to and it's not possible to say putting them all on the same team/project would move that forward - or that they would even want to do that.

Does it waste a certain amount of effort in duplicated work and products? Sure. But we also get new projects that may try new approaches, gain different experiences, and train new developers which all helps the market expand. Ultimately it's better to have yet another version than nothing at all.