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.
Slightly more powerful than the SpaceX Raptor (550 lbf for the BE-4 vs 500 lbf Raptor) both engines are designed for re-use. As the BE-4 gets closer to production, and the Raptor gets some flight tests under its belt, a clearer picture on the thrust to weight and dynamic range of throttling will become better understood.
But the really awesome thing is three orbital class re-usable engines available from US vendors for the first time ever. This bodes well for the US space industry. Not so good for Aerojet/Rocketdyne which, in my opinion, has basically rested on its laurels as the "only game in town" for US built engines for far too long.