I see where you are coming from, and certainly I've seen what your talking about in Neijia systems (Taijiquan and Baguazhang specifically) but in my modest experience with Aikido, I can't say that anyone I've ever met was able to effectively use their training for power generation relating to punching and kicking. I'm not saying it can't be done, but I've never met or heard of anyone doing it in Aikido.
More to the point, here is a quote attributed to Morihei Ueshiba I've come across a few times:
Kicking leaves you momentarily on one foot, and for that moment you are in a very weak position. If you were to be swept off your feet, you would be finished. This is why lifting your feet off the ground is crazy.
If it did come from O Sensei (and I've never seen or read of him kicking anyone lol) then clearly he indicates he wasn't a fan of kicking in Aikido and didn't see a need for it. Although this is speculative I haven't came across anything where he advocated kicking or claimed that Aikido training would allow you to generate powerful kicking techniques.
Whether or not O Sensei said that, it is something that is common to the vast majority of Japanese arts. I think karate is the only one that employs kicking (let me know if I've forgotten one). Otherwise the footwork is very solid and the 'budo way' of walking is to keep the feet very close to the ground while stepping. It's almost a shuffle but more deliberate and does takes practice.