TBH indexing became much less important with every language adopting some sort of "for all" and map/filter/reduce constructs. If you don't care about indexes you don't need to think about them (finally!).
The remaining cases are by definition edge cases and warrant enough attention that bugs caused by 1- vs 0-based indexing doesn't seem to be a big problem in practice.
It's like with goto and structured programming - people stopped using goto for loops and ifs, so the remaining cases where goto is used as last resort aren't much of a problem. People think hard before doing this.
The remaining cases are by definition edge cases and warrant enough attention that bugs caused by 1- vs 0-based indexing doesn't seem to be a big problem in practice.
It's like with goto and structured programming - people stopped using goto for loops and ifs, so the remaining cases where goto is used as last resort aren't much of a problem. People think hard before doing this.