[dotnet00]

The reusability on BE-4 is not theoretical.

Yes, the ones flown on Vulcan do not do relighting. However, we do know of engines BO has test fired where they have tested restart capability.

https://twitter.com/blueorigin/status/1521204214084796416

[panick21_]

Many engines that are not reusable can be started multiple times. Actually having the certification that you can relaunch with the engine after you have done a reentry and landing is required.

[dotnet00]

That's a pretty convenient goalpost to move to. Raptor also is only theoretically reusable by that metric.

[Teever]

it's not goalpost shifting at all.

BO doesn't have a reusable engine until they demonstrate that their engine is reusable.