Well, in the case of a new IP which is following in the footsteps of an established game with an established fanbase (I'm not downplaying Planet Coaster, but I'm sure we all see it as the spiritual successor to RCT3, which is a good thing in my eyes), then they probably know the people who will participate in an early form of the game are from that established fanbase and will have honest suggestions and thoughts after playing an early build. We all want a great game and with access to an early form of it, we have the chance to let them know that it's heading in the right direction. I'm getting sick of games that launch with problems that could have probably been solved if fans had been given a chance to have a look first.