I'm sorry this was downvoted. It is probably a bit too pithy for HN.
I think you raise a good point even if there are some "technicalities" about it.
Real question: I'm not an aerospace geek. The term "first stage" has probably changed at lot in rocket science in the last 50 years. From the NASA Space Shuttle to SpaceX Falcon 9, has the definition changed? From my elementary school memories, the Space Shuttle used a giant center rocket and two booster rockets that we expendable, but you are definitely right that the Space Shuttle "thing" (no idea how to call it) was used over and over again, (somewhat) safely. Something that I don't know: Where Apollo programme capsules reusued? I assume no.
I think you raise a good point even if there are some "technicalities" about it.
Real question: I'm not an aerospace geek. The term "first stage" has probably changed at lot in rocket science in the last 50 years. From the NASA Space Shuttle to SpaceX Falcon 9, has the definition changed? From my elementary school memories, the Space Shuttle used a giant center rocket and two booster rockets that we expendable, but you are definitely right that the Space Shuttle "thing" (no idea how to call it) was used over and over again, (somewhat) safely. Something that I don't know: Where Apollo programme capsules reusued? I assume no.