Things like antibiotics are plenty accessible - 3rd world countries are literally overusing and misusing antibiotics to the point of causing drug resistance in TB. "Effectively we do not have [thing] because we have not made that [thing] accessible to enough humans" is an exercise in goal-post moving.

About 15% of people over the age of 15 are illiterate, but it'd be silly to say "effectively we don't have literacy", even in a global context. Depending on the stat, 1 in 10 don't have access to electricity, but electricity has been in 50% of American homes for over 100 years.

The reality is that the future is unevenly distributed. AI and more broadly technology as a whole, will only exacerbate that uneven distribution. That's just the reality of progress: we didn't stall electrifying homes in NYC because they didn't get electricity in Papua New Guinea.

If AI discovers a cure for cancer, it may be incredibly unevenly distributed. Imagine it's some amp'd-up form of CAR-T, requiring huge resources and expenses, but offering an actual cure for that individual. It'd be absurd to say we couldn't consider cancer cured just because the approach doesn't scale to a $1 pill.