Blocking some people can lead to undesirable experiences. This is because when you block someone, they know you blocked them, which can create unnecessary tension. The ability to hide someone's profile from your grid, combined with the mute option that already exists, can be a safer option for someone who may not feel comfortable blocking a user, but also does not want to interact with them further or see them on the grid. Plus, being blocked doesn't always feel great, so it can be a more gentle way to handle things. I believe this would create a safer user environment.