You said that B-Trees "use in indexing has dwindled with time". This is demonstrably false.
> Back then I used them ubiquitously but I honestly don't remember the last time I've seen one in a new design.
Even if that was true (which it definitely isn't), why would anybody judge the commercial or scientific relevance of B-Trees by looking at what new systems do? There are very few new systems that are intended to be competitive as general purpose systems, which is where most of the market is.
You still haven't actually named a single example of a "modern database kernel" that exemplifies what you're talking about.
You said that B-Trees "use in indexing has dwindled with time". This is demonstrably false.
> Back then I used them ubiquitously but I honestly don't remember the last time I've seen one in a new design.
Even if that was true (which it definitely isn't), why would anybody judge the commercial or scientific relevance of B-Trees by looking at what new systems do? There are very few new systems that are intended to be competitive as general purpose systems, which is where most of the market is.
You still haven't actually named a single example of a "modern database kernel" that exemplifies what you're talking about.