Removing humbucker covers will allow slightly higher adjustment to the pickups and can increase unwanted electrical interference. I do not like to remove covers from most Fender guitars as the strings can easily get snagged under the lip of the flatwork. Removing covers on Fender style pickups normally exposes the bare coil or magnet wire which could become easily damaged by accidentally hitting the coil with a guitar pick, fingernails, strings and foreign debris. Removing covers can expose the coil and bobbins to excessive moisture from condensation, sweat and humidity. And don’t let anybody play your guitar that’s not familiar with your setup and string gauge.