I'm talking about a machine from which you would choose one agent at a time and once you shoot "Start", the machine throws out every ability of that agent, with a couple second intervals between the abilities.

Why? So that you could learn what enemy abilities do to you. I'm fairly low level and been in and out of Valorant a few times. I remember coming back to the game after a break when Fade was a new agent to me. I couldn't really figure out how exactly her abilities interact with enemies, because when using them as Fade on the Firing Range they wouldn't do anything to me. Gekko is another one now whose abilities I cannot really learn in the Firing Range, how does it feel to be on the receiving end. Having to learn this in-game (especially when I only want to play competitive) feels bad.

I think a machine like this would be great for new players or for those who've taken breaks.