The best thing about the extra teams is definitely more African sides. They’re the hardest done by IMO. This World Cup alone you’ve got no Nigeria, Egypt, Ivory Coast or Algeria who all have pretty decent sides. The drop off between the sides who qualified isn’t much at all. Same with Europe and South America.
It’s the extra Asian sides and North American teams plus New Zealand guaranteed a slot that drop the quality. Obviously fair to have it split evenly and maybe at some point in the next few decades with all the money Asia at least improves to a better quality.