Yeah I knew what you were talking about with the bent arms. A lot of inexperienced lifters use their arms on just about all lifts.
Look with shrugs who the hell cares? It’s a barbell shrug. Not even an exercise I would be doing if I was inexperienced.
If you do them then practice doing them with straight arms as it will teach you to take arms out of the lift. If you can’t then dump barbell shrugs.
Do this in a deadlift though and it is a big problem. It is a technical lift so focus on getting the form perfect. I actually find people lift better when there is a bit of weight on the bar. Not too heavy but if it’s too light then you subconsciously know you can lean forward or bend your arm or raise your hips too soon etc… and nothing bad happens. When lifting a bit more weight then we automatically try and set up better , keep the bar close to the body, pull with a bit more purpose ,chest out, keep tight etc…
If you find it too hard then dump conventional deads for a while and focus on Romanian deadlifts.
Start with the bar in a rack in the standing upright position grab the bar and take a step back . Now in this position your arms should be locked straight down. Now with your chest out and back arched force your hips back and slide the bar down your legs just past the knee. Now maintaining an arched lower back thrust your hips forward hard until your upright again. Now this is a great way to learn how to keep your arms straight and how to use your hips. It also teaches you how to keep your chest out and how to brace your back with a lumbar arch.
The knees should be slightly bent.
This is one of the best exercises for hamstrings, glutes and erector spinae. Once you can master this then you should be ready to get back into conventional deads. RDL’s should be a staple of any training plan.