In karate we call that juji-dachi (crossed stance). It is used extensively throughout this kata (https://www.youtube.com/watch?v=HHtm-eJYcg8), where it is either the ending or the beginning boundary for a technique.
Note: You don't stand in the stance and throw techniques, you throw techniques either starting or finishing in the stance. The stance is what happens between techniques.
In the first usage, dropping into the stance allows 180 degrees of movement from the hips and upper body, generating a large amount of force in the elbow strike. It also sets you up for the whiplash strike and block combination that immediately follows.
It is used again almost immediately as the practitioner drops into it to gain distance from the next attacker while receiving an attack, then gets the 180 degrees of hip rotation to generate a powerful punch.
It's next use is almost invisible, but is mirrored in almost every form in any style. When turning in a form, in any style, you pass through the stance at least briefly. This is the source of the power for those impressively powerful blocks in beginner forms.
At about the midpoint in the form, there is an application similar to the one demonstrated in @Rophuine 's comment above. The practitioner moves aggressively sideways into a block or strike, with the intent of immediately exploding in the opposite direction.
Towards the end, the practitioner drops into this stance to perform a jamming technique. The bunkai (analysis) is that it's a stable base that can be dropped into when the intended punch was interrupted by the opponent charging, to execute a jam and set up for the much stronger followup attack.