My brother in law fell in a creek at high water (also strong current) with them, it scared the hell out of us, the legs was floating and he was struggling to keep his top end out of the water... then they filled up which can also be dangerous but we got him out by then. and I agree for the summer ... I used them during the fall and winter for trapping.I've used hip waders. They fill up - they are a PITA. I would never consider them dangerous.
I've always got wet/muddy when working in/around water. So...... old pair of tennis shoes - old pair of jeans - raggy T-shirt.......OK mate, lets have at it.