“Full flow engines can’t be made!”

“Okay, they can, but the engines are too complex and expensive!”

“Okay, they can be made much simpler and cheaper, but they’re not powerful enough!”

“Okay, they’re powerful enough but the heat shield won’t work!”

“Okay, it works, but catching a rocket is impractical!”

“Okay, catching a rocket is practical, but…” <—- we are here.