It reminded me when a chiropractor did his initial assessment on me for a whiplash injury among other things. I wasn't bracing but couldn't stop him from pushing my arm down. When he had me turn my neck, I was solid. He had me do it again and it was the same deal.
There is probably something to it.
I do a lot of cross crawling (marching, walking, animal crawls) and I have noticed an improvement with my nervous system and overall movement. My gait is way, way better than it used to be.
If you have to brace your core like you're taking a dump after eating a large four-cheese pizza for squats more power to you?