I've read and reread this (and can't wrap my head around it) . Could you expand on what you mean by Aikido absorbing the least desirable of the teaching models?
The old teaching model doesn't include a lot of verbal explanation and instruction, but it does include a clear progression of technique and kata to develop the student towards a clear goal of mastery. It also includes an emphasis on spending a lot of time training directly with teachers and seniors to be sure students don't develop bad habits and to ensure that they get the lessons the teacher wants them to get. This is all done in an atmosphere of deep respect to the teacher, while doing lots and lots of repetitions.
Aikido has thrown out the clear progression of kata for students, with everyone doing the same techniques together. The teacher is deeply respected, but no longer spends most of the time working directly with students. Beginners train with whomever they can catch. The teaching model is the instructor shows something a couple of time and everyone tries to duplicate it. Teachers rarely act as uke for students, so the students don't get the kind of feedback that makes the learning process effective. In many styles of aikido (but not all) there is no clear pedagogy of how to train students and effectively bring them along to the higher levels of skill. All that is left is someone senior demonstrates the techniques they feel like, and everyone else tries to duplicate it. Without a clear pedagogy, and without the critical feedback from the teacher and seniors, student progress is random and slow.