If anything, my criticism would be in the other direction. The sections are too narrowly grouped in terms of theory. I have a non-fluent understanding of what

If anything, my criticism would be in the other direction. The sections are too narrowly grouped in terms of theory. I have a non-fluent understanding of what "subjunctive perfect" means in my home language, but I guess I deal with it OK. As such, I don't find it valuable when I see that section on Duolingo and think "OK, it's subjunctive perfect time!"