Multiple attacks and ground wrestling are the singular best forms of training practice you can do.
However, in a live survival situation, these are the very things you try to avoid.
Why the apparent contradiction?
There is none. These are the essential backup you will need when things vary from preferred of standing up and fighting the rare one individual which seldom happens.
These are the extremes that do happen.
The worst mix is to get caught on the ground when the opponents are multiple. There are training techniques for this which are concealed by the partly veiled Hanmihandachi (also: Hanza Handachi) methodology. This is the most critical of all training, if you intend to be a survivor of, “crunch time.”
On their own, these forms of training teach much but only in the context of thoroughly understanding the basic techniques. I won’t even begin to go into the benefits of ground wrestling but it opens your mind, enhances your body-mind connection, fortifies your ki and your ability to read intention, teaches balance and among many other things gets you immensely physically fit, augmenting your cardio/stamina as well as muscle strength, resilience, flexibility and co-ordination.
Multiple attacks training is the preeminent survival training. Words don’t cut it. Do it.
Hanmihandachi, now grossly misunderstood and mostly poorly practiced as mimicry without understanding, holds the keys to not ending up on the ground and many other things not easily depicted in words. Here too, do it, train and practice with a thoughtful and questioning open mind.
Long before a certain shoe manufacturer thought of it, one of my best teachers would often say, “Just do it!”
As for Budo, this I recommend most heartily, particularly when exploring to uncover the immense potentials of Aikido.
Tomorrow never comes. There’s no time like now.