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.
In any case, even if the discardables are all new, it's a shameful step back. I am so glad they have competition now.
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.