The reason most educational software is not like this, as far as I can tell, is that the incentive structures aren’t there. Maximizing learning just isn’t a priority for most schools.
For this new breed of software though, they’re selling to parents, at fairly high prices. Some parents really care about their kids actually learning, and so the incentives are much more direct and aligned.
I hadn’t heard of Mentava, how does it compare to Lexia Core 5? I’m a little skeptical of claims like “my 2nd grader reads at a 4th grade level”. I’m privy to the standardized tests and I found the grading super inflated.
Ask any youth today about the smartphone in their pocket. Do they have any inkling of the decades of research and development for that device and it's capabilities to coalesce into what it is today? I mused once on some public forum about the inverse square law and how it applied to the fantastical ability of a smartphone to connect with a cell tower 5 miles away. The power received by the tower is approximately 3 times 10^-13 Watts or -95.15 dBm. This, to me is almost magical. Yet the forum members did not even know what the inverse square law was. They just ridiculed my comments and literally downvoted my musings to zero. I can't comprehend the ignorance of today's society.