Because in normal play it’s very hard or impossible to do. The batter is facing away from the catcher, who is the one signaling. Now that there are more high-tech ways to do it (telephoto lens cameras, ways to communicate things to the batter, etc) it’s just become a much bigger problem. A properly hidden signal would be visible to 2nd and maybe 1st/3rd bases, and the players there would have a harder time seeing and communicating signals. Nowadays, someone with a high-powered camera and a radio in the bleachers behind center field can see and relay things to team members and coaches with extreme ease. And past success doing it has only emboldened people
Because in normal play it’s very hard or impossible to do. The batter is facing away from the catcher, who is the one signaling. Now that there are more high-tech ways to do it (telephoto lens cameras, ways to communicate things to the batter, etc) it’s just become a much bigger problem. A properly hidden signal would be visible to 2nd and maybe 1st/3rd bases, and the players there would have a harder time seeing and communicating signals. Nowadays, someone with a high-powered camera and a radio in the bleachers behind center field can see and relay things to team members and coaches with extreme ease. And past success doing it has only emboldened people