Krist And one advantage of Rail Europe is that you can do Interrail reservations without having an actual pass
Sorry to contradict you again, but Rail Europe generally requires a pass number to reserve a seat. However, this pass doesn’t need to be activated. I believe there are exceptions, such as Spain.
For Italy, you can reserve seats without a fee and without a pass number through ÖBB. To my knowledge, ÖBB reservations cannot be imported into the Trenitalia app and modified online.