Many teachers, after years of training his ukes in specific way of receiving,
For the record, Iwama style teachers and schools are no different to other aikido schools in that they also train their uke in specific ways of receiving. Some aikido styles out there like to claim badass aikido or "the real aikido", and many like to put down other styles. Truth is they all use the trained uke model, whether it's a more technically-oriented style or not. As soon as they go out of their style with different uke, their stuff doesn't work as expected anymore (it only takes a bit of experience and honesty to observe this). If any particular style had the "real goods", all
aikidoka would flock to that style just like people flocked to Ueshiba and Takeda. But that ain't happening, right?