Dealing with and relying on ULA will be the Bezos' space endeavors undoing. Similarly as if Russians agreed to the original Musk idea back then - there wouldn't

Dealing with and relying on ULA will be the Bezos' space endeavors undoing. Similarly as if Russians agreed to the original Musk idea back then - there wouldn't be SpaceX today. Technically going hydrogen way Bezos cornered himself - the turbine would be extremely expensive and reliability is an issue, and by not doing it so far they are very limited by expander and tap-off.