I’m talking about a realistic limit much closer that the speed of light. My point being, that perhaps there is an even closer limit that it hard if not impossible to overcome for an intelligent life that’s contained in a biological vessel. Given how things in space are measured in light years, perhaps the time it takes to traverse these spaces far exceeds any biological lifespan. Put it bluntly - everyone could be moving at each other, but given the distance apart they would still die off before meeting one another, because of the time differences involved.