Isn't Astra developing a reusable launch system now?
Plus, they're kind of at a bad point and time in the market as small launch is not as lucrative as they hoped but moving up to medium lift is a big hurdle. So far, SpaceX is the only 'new space' launch company to have managed it, with all other competitors in development hell.
By saying development hell I'm saying that other new space companies other than SpaceX are in that difficult in between point where they're burning cash on developing the rocket without yet being able to sell significant rides and without the leverage of knowing that the government will give you a blank check if you run out of money.
The important factor being that small launch doesn't make enough money to fully fund medium launch, there just isn't enough demand for small launch with rideshares being cheaper. However, medium launch can fund more medium launch or even heavy launch, as there is much more demand in the medium weight range.