Retractors themselves dangle from whatever they are clipped off too and usually have plastic clips that break when needed. And then the equipment that is attached to the retractor dangles from the retractor also usually on a plastic snap clip that is prone to break when needed. And the cord or wire itself is just not trustworthy for something valuable.
Retractors can be mounted directly to the BCD either using a pin that goes through webbing or a removable backplate that traps the strap in between the retractor and the backplate, resulting in it being firmly attached not dangling at all and many retractors including the ones I use have all metal clips on them.
I was warned retractors will fail. Springs do not like salt water, retractors aren't easy to maintain and once they stop working well you have a dangly underwater... a spring reel, working in salt water has a very limited lifetime.
Don't believe everything you hear, don't be afraid to try things out for yourself rather than heed the warnings of others. I've had several retractors on my gear for hundreds of dives over decades with no issues. Besides how do you know a spring reel in salt water has a limited lifetime since you are afraid to use a retractor based on what somebody told you?