We only type blood to a certain degree. There are more factors than just A, B, O, and the Rh factor. If you are transfused with your own blood you know all of the factors will match, not just the ones we test for.
And of course, you will only get the contaminants you already have, no new ones. However, if you have cancer or an infection you would do better to get a transfusion of someone else’s “clean” blood.
Arguably, if you are a Jehovah’s Witness or in a religion that is against blood transfusion, it is possible that you could justify having your own blood returned to your body when not able to consider a donor transfusion.
This gives some of the pros and cons of autologous blood transfusion versus donor blood transfusion, and also mentions bloodless surgery.