The precooler / heat exchanger is the SABRE's distinction. Ramjets and scramjets don't have such. It enables low internal gas velocity and small compressors and

The precooler / heat exchanger is the SABRE's distinction. Ramjets and scramjets don't have such. It enables low internal gas velocity and small compressors and more thrust from a smaller engine and higher top speed than jets. It's like saying when the Wankel was invented that "it's just another internal combustion engine". Sure, it is, but it's quite different from most of the others.