Remoak V1 was long thought of/described as decision speed but so many people went off the end of runways rejecting AT V1 that a rethink was in order. Its better to think of V1 as a decision MADE and ACTION TAKEN speed.
At a previous airline we would remove our hands from the thrust levers approx 5 kts before V1. Where I am now uses a wet V1 for ALL departures which amounts to the same thing.
Either way if you lose an engine a fraction of a second after you remove your hand from the thrust levers YOU ARE GOING and you'll be a fraction below the screen height on a performance limited runway - on a typical runway you pass the end of the clearway at hundreds of feet anyway.
If you decide to reject AT V1 by the time you react, slam the thrust levers closed, autobrakes kicks in (or you stand on them) and the reversers deploy and spool up you'll be significantly above V1 by the time you stop accelerating and start to slow down.
Hence V1 is a GO speed.