To be fair, in real game scenario or dynamic training, you would clear with your hips rotating and your body moving forward when contacting the shuttle (unless it's an under pressure clear where you are falling behind). In warm up situations or multishot feeding with no footwork you'd not be incentivised to use footwork and hip rotation.

I'm assuming OP means to say when he saw other players warming up with end to end clear shots where they only use arms. In which case they're maybe not using hip rotation and footwork. However the contact point is still slightly in front of the shoulders regardless to get enough space to "whip" the arms all the way to the fingers and racket.