For example, I used to do integrations for sports betting sites. AI is going to help with the basics, like understanding the default puck line is 1.5 in hockey. AI is not going to realize that Bet365 changes their API endpoints for each season, so you need to be ready to fetch the updated ones before the new season starts, whereas most other sportbooks have consistent endpoints that you don't need to keep updating.
How much domain knowledge is actually unavailable to AI is going to vary by domain, as will the value of that. Chess is probably one extreme, where all knowledge is public, whereas something like military R&D might be the other extreme where domain knowledge is tightly guarded.
The other things you describe, such as endgame tables, are really more related to the domain of chess-computing, a subdomain of algorithms, and likely something you exceed your friend's knowledge in.
Getting to a high rank in chess isn't about better domain knowledge, is about application and experience.
Should AI make you really good at frontend development?
No, you do not become a really good FE dev from having used websites with AI in the mix.
Why should chess be different?
But OP wasn't talking about solving optimalization problems, but understanding the rules of a business domain.
As we now know it, AI pretty much means a language model and the product of programming so many times is thought to be completely represented by the output of a language alone.
On top of that programming languages are more structured and logical than average, so impact on other less-logical efforts (having more scarce clear-cut examples in the same huge training set) can be expected to be less drastic even if they are language-centric also.
It really is working so well for some programmers so far that that's got to be a big one, and possible to push closer to the finish line than lots of other things. And it really is huge "software" companies that are putting up all the big bucks, dwarfing anybody else who's focusing on non-programming languages, or even more rare, non-language AI.
Almost all the money is being put into their own domain, how else would they have the decades of domain experience to best gauge progress which is still needed, plus get the most positive reinforcement from the underlying math & logic.
There's plenty of momentum and critical mass of people already where if AI does turn out to only be for programmers, they'll be just fine with that if they can just make it more true than it is already. That's enough work to keep them busy for the foreseeable future right there.
Doesn't look like any comparable momentum otherwise, it's like a snowball vs an avalanche.