I think this quote by the great Artur Rubinstein says it all:
This is, however, not an excuse to stop progressing at something you really want to achieve. At the same time, knowing and recognizing your limits is also a blessing.
I strongly disagree with what Artur Rubinstein says in that quote.
To keep a long post short:
Person A grows up in the ghetto, never learns the piano, suddenly at age 40 decides to learn the piano and in 10 years is almost concert level. In those 10 years he's played for at least 2 hours a day, topping at 10 hours a few times. E.g. hard work.
Person B grows up in a fancy neighborhood and has had lessons from the moment he could speak, at age 15-20 he is almost concert level. In those 10-15 years he plays the piano variously, with one hour a day, to 30 minutes a day, to 5 hours a day. E.g. hard work.
Hard work = most important factor = talent.
I know, it's hard to realise that everyone could potentially rise to one owns level, but that is a fate we have to acccept.
If you want to call it talent fine, I call it adaption to the environment. When your environment changes, you change too (brain wise).
Perhaps talent is the thing that people who are lazy lack. Perhaps being lazy is something that kills the talent in you. So in that sense, talent does exist.