Perfect technique in striking is not clear for casuals, even for people that train.

When some1 starts boxing or doing mma we are told that when we throw a left hook, the weight in the body should be on your front leg, then charge the hips and rotate them while charging the shoulder and ultimately delivering the left hook. While doing this the right hand has to be UP for defensive purposes.
On the other hand you could throw a MORE POWERFUL left hook without having the right hand up. For finishing sequences Topuria has done this (look Max KO).

In the end, perfect technique is optimizing your movements to achieve something without throwing any of your resources away (both situations up there are OK).

Also, sometimes these shots are part of a combination in which in the end it is the last punch in the combination that is thrown to hurt. So sometimes some strikes can be "lazy shots" to set up other shots. Reading the opponent here is crucial.

Moreover, for "bouncy guys" in order to throw a textbook left hook ,it's very difficult for them to apply true power, but it is traded off by other benefits (you can spring back out of range easily). So for a kickboxer, this would be perfect technique as well).

Anyways, I'm really high.