Nintendo restricts this primarily to prevent piracy. If you could copy a game to your console and then remove the cartridge, you could pass the same cartridge to a friend, essentially giving away free copies of the game.
Some large games (e.g., BioShock or Borderlands collections) only include part of the game on the cartridge; the rest must be downloaded for free from the Nintendo eShop . The Only Way to Play Without a Cartridge download switch games from cartridge
Official Nintendo Switch software from a physical cartridge to the console's internal storage or an SD card through standard means. Nintendo restricts this primarily to prevent piracy
If your goal is to play without swapping small cards, you must purchase a of the game. The Only Way to Play Without a Cartridge
Most physical games require mandatory downloads for bug fixes or day-one patches, which are stored on your console or SD card.