I have seen folks RVing who can't walk around their rig without using it as support. I have seen folks RVing who don't have the strength to open a jar of pickles. I have seen folks RVing who have severely broken their ankles, hips, etc., just tripping over their own feet.
While most folks may be able to break through an RV door, not everyone can. Whether it's due to osteoporosis, current or past chemo treatment, phobias, genetics or whatever, not everyone is capable of breaking through the RV door or going out the emergency window.
And, considering the pretty much universal agreement that RVs are built horribly, I don't think I'd trust that the manufacturers installed that bar correctly so it wouldn't lock someone in.
So, if folks offer ways to keep the bar from sliding into its locked position, or recommending tests to make sure you can pop it open if it did lock, I say good. It doesn't hurt anyone and just might keep someone from seriously injuring themselves, physically or mentally.
I don't think it warrants "this is silly and unnecessary".