Yes from personal experience (i am a Shodan in Shorinji Kempo and Nikyu in Kendo).

The "Kiai" is a staple of Japanese Martial Arts and is not easy to Master; you have to get the Timing and Source right else it is just a shout from the throat instead of a energy inducing sharp exhale with sound from the belly. It is also the case that in Japanese Martial Arts it is more stylized and loud than is necessary; a simple grunt/shout (as is found in Chinese/Other Martial Arts) with the correct Timing and from the correct Source is more than enough.

1) https://en.wikipedia.org/wiki/Kiai

2) https://kojutsukan.blogspot.com/2018/03/the-science-behind-k...