Loners learn to take care of themselves quickly. It’s the only way they can survive when the rest of the world is teaming up to make sure there is someone watching their backs.
But loners have the advantage of knowing well in advance they will have to fend for themselves. They don’t have (or don’t choose to access) a large bank people and resources to pull from when they find themselves painted into a corner. They also avoid situations that have the potential to paint them into a corner.
If you are a loner, you will find youself in situations where you are the only person defending yourself all the time. If you are not a loner and have no desire to be, there will still be plenty of circumstances in your life where you will find yourself on your own with no support. This may be an issue if you face insurmountable odds, or it may be a totally ignorable circumstance when the battle is over.
But you don’t know when taking a challenge on solo will be a problem until you take it on. You can prepare for solo challenges better if you know where your backup is and when they probably won’t be around.