I disagree. I think it's totally possible to say "X kind of training would improve your aikido" without picking over a hundred years of the history of X training and who did or didn't previously have it. I think it's totally possible to say "modern aikido could be improved" without diving into the political tradeoffs that led to it being the way it is. Especially for those of us who are not Japanese and were not even involved in the art (or, for that matter, born) when some of the key events took place.
Of course what you say (improving aikido) is possible. But knowing the hows and whys of the current state of aikido can help the next generation (or even the current one) to avoid falling in the same traps for those who don't know history are destined to repeat it.