It 100% is if you live in or operate in a high crime area known for vehicle break-ins. Like OP of the comment.
In many parts of the world, including major cities, it would be okay to leave your belongings in a locked car.
It's crazy to me other people just live with this. Dramatic action is needed and possible.
I don't own the key to my house, it's not something we think about here (US, south).