>>16774377
>DC-X
It was a toy that was only good for learning how to do a powered landing. There is no way to get to Urf orbit without staging*, and DC-X was not going to get a booster.
*you might be just able to get there with zero payload margin, but good luck getting back down
SpaceX did their DC-X clone as a proof of concept then immediately started working on the whole system that it needed.