So, what's V1 really about, then? In regard to the question, it’s about safety.
Runway length is a practicable limit and must be considered; we don’t have the luxury of infinite runway length.
Safety is about risk and managing risk. Stopping at speeds above V1 involves proportionately greater risk, and limits such as tyre speed and brake energy have to be considered irrespective of runway length.
Talk to your ‘Captain’ about brake temperatures, likelyhood of fire, tyre burst; then what risk is there in infinite operations – perhaps infinite risk unless it is bounded; V1 is just one boundary.