Blue Origin demonstrates that. Panned for being "behind" SpaceX, but when they fly stuff it tends to work and suddenly they caught up.
A day or so ago Blue Origin had a launcher explode on the pad for a spin prime test IIRC. I'd bet it was probably the second stage considering the last launch also had a second stage failure that failed to put it's payload into orbit and we've had no news on what happened to NG-3's second stage or where it's coming down.
That's not a criticism of Blue Origin, New Glen is needed. It's context on how second stages are hard to produce because they have to operate in zero gravity. So far N.G has had two, IIRC, second stages operate, however this last failure will probably put them back by about a yes.
So B.O is externalizing big risks launching customer payloads knowing this is the case, reason being is their competition for Starlink, LEO has federally mandated deadlines for them to launch otherwise they loose their license to operate it.
Now contrast this with SpaceX's approach, 12 launches whose multiple goals include testing second stages in zero gravity environments that destroy the hardware as an expected result. So even though they haven't launched a commercial payload yet with StarShip, the real payload is the operational experience they get from each launch.
I think B.O will catch up because they have a re-useable first stage for a stack that offers greater flexibility than SS however SX is simply proving that there is no substitute for the experience of operating space craft in space.