Who would buy an Nvidia alternative with same price and same specs if it is known that Nvidia has decades of more experience in writing drivers targeting specific games.
Your argument is nonsense. Of all the possible ones, you had to pick this one?
"Who would buy [new thing from new people], when there's [thing] from old people with experience?"
If everyone thought that way, there'd be no progress. Why did people buy IBM-PC clones? Why did people buy AMD chips, instead of intel? Why did Microsoft release the xbox, when there's Nintendo and Sony?
But sure, it's about "same price and same specs". That's obviously not going to happen, though!
So what if they sell a low-end GPU at an actually reasonable price? The market's ripe for the taking! Low-end cards are utter trash and a rip-off, because there's no incentive for the big ones to produce any good ones!
And what does it matter anyway, that they have experience writing drivers for specific games? The vast majority of games out there do not fall into this category ... and that's hundreds of millions of games.
The vast majority of people don't play the latest and greatest, also not on "the best possible graphics settings". They don't need that. It's a niche for those customers who are willing to pay the price for hardware that offers nothing beyond "nicer visuals".
That's not a majority, at all. There is no majority of people requiring drivers adapted for specific games. There is no majority of games benefitting from such drivers, either, but there's a huge market for reasonably fast, reasonably priced lower-end cards!
