I didn’t believe in talent until after I spent over ten years trying to learn music, and then seeing 5 year-olds on YouTube doing stuff I can only dream of. True, some, perhaps most of it is hard work, but talent makes the process a lot easier.
With physical abilities this is more accepted but I don’t see a reason why mental capabilities would be any different. Some people just have more powerful brains by birth. You can achieve a lot by exercise and discipline but some people can achieve higher levels than others.