Who is 'they'? What research are you drawing this from?
Theres are a few varying opinions actually. This is where i got my info and its not the daily mail but an abstract from a scientific research. Some say the ostrich came from a flightless bird like a bustard.
Revealed: The emu and ostrich can't fly because their ancestors became fat and lazy when the dinosaurs died | Mail Online
Then they're not workable. If it's too heavy to use its wings, they don't work. How can you say they're functional...when they don't function?
Yes they are not functional but they are fully developed. We are talking about how the wing first evolved from a creature with no wings. Not a creature who has fully developed wings and can't use them for what ever reason. They are not functional as far as what they were designed and needed for, are they not.
But, in acknowledging that an ostrich can use its wings for things besides flight, you've already admitted that a bird can get usage out of wings even if it can't fly with them. If an early bird can use its wings for mating like an ostrich does, why doesn't that count as it being functional?
But the early bird who would be the first one who is getting the wings from say a reptile wont have the wings in the first place. So we are not talking about full wings that cant be used. We are talking about stubs of wings which to me are no good for anything.
Then you have to start making a case for what the stubby feathered things would be useful for. IF they started out as wings then thats what they will become so they can't be used for anything else along the way. IF you did find something and it was for something else then why did it start to develop wings in the first place. If that something else becomes needed for something else then they are not going to be wings anymore. But that just complicates everything.
What do you think a 'partly formed wing' would even look like, and why couldn't this 'partly formed wing' be functional? Again, just because it can't fly with the thing doesn't mean it can't use it for something else, thus making it functional. If something has a function, it is functional, correct?
But it wouldn't be a fully developed wing yet that could possibly be used. It would be a stub or a sort of wingy thing with some feathers sticking out, i dont know. All i know is it wouldn't be a fully developed wing unless it popped out in a very short time and can be used straight away.
How can you look at a wing and tell it has absolutely no use whatsoever, especially when there are variety of birds who use their wings for all sorts of things, even if they can't fly?
Those other birds have fully developed wings and for what ever reason they cant use them as wings. But they are not stubs or legs or bumps of skin and feathers they are wings. They cannot use them for what they were designed for wings. Thats what evolution says they got wings for wasn't it to use them for flight.
This argument makes no sense. You clearly acknowledge that a bird can have wings that it can't use for flight but still use for other things, and then you turn around and say that a bird who can't use its wings for flight must be nonfunctional, but you don't say how you know it can't just use it wings for other things.