It's your computer. I can confidently say after 200+ hours of gameplay that Valheim has never crashed. Not once. Nor have I lost any items or had anything out of the ordinary at all. Stop blaming everything on the game, it's hard to make something work with every single damn computer in the world. The game saves upon exit, regardless of the last time it saved. Your computer constantly crashing and therefore not saving is not the game's fault, and you can force a save with the console whenever you want. So solve your problem instead of complaining.