The whole 'I belong to myself so I'm walking by myself' idea never registered on my radar since most people have not subscribed to the actual meanings behind the plethora of antiquarian/medieval wedding customs in decades if not centuries. They're just following the motions because tradition feels safe and comfortable. In 2020, most people know that couples decide for themselves and weddings as business transactions are not a thing so they don't bat an eyelash.
That said, I don't want to walk down the aisle by myself because I know I will freeze up if there isn't anyone with me. The stage fright is an automatic response with all eyes on me, even in the smallest groups. Having an escort has nothing whatsoever to do with being traded off as property, etc. But I don't know a male friend/relative to ask off the top of my head. Would it be strange to walk with a random relative or fiance down the aisle?