Which engine (other than BE-4 and Raptor) is the other 'orbital class re-usable engine' that you speak of? The newly constructed RS-25 that's going to be produced in the SLS program is not reusable (lookup RS-25E).
I overlooked it mostly because the Merlin engine uses RP-1, and therefore has limited reuse life due to soot buildup in the engine (unless they've solved that problem). I also suspect that the Merlin engine only has limited time left as (when) SpaceX transitions to Starship.
The real issue with that engine isn't its reusability, it's that the industry has learned a lot about rocket engine design, operation, and manufacturing since the RS-25 was developed. That's reflected in the engines available from the likes of Blue Origin and SpaceX. No knock on the RS-25 - it stands as a watershed achievement for humanity in the engineering of thermodynamic systems.
Though calling the SpaceX engines "available" needs the caveat that SpaceX will not make them available outside of SpaceX.
In any case, even if the discardables are all new, it's a shameful step back. I am so glad they have competition now.