It really is a subjective question.

I enjoy exploring new seeds, establishing a foothold, trying to be all iron man and so I don't necessarily need new content to keep playing (but new content is always welcome).

I also play other sandbox-ish games like KSP (Kerbal Space Program) and even though I have landed on different planets (some consider this 'beating' the game) and there is no new content I still enjoy shooting Kerbals into space.

I suppose if you play with the goal of defeating bosses as quickly and efficiently as possible then I would agree with those that suggest you wait for another content drop.

But if you enjoy the other things the game offers then I would argue it offers value as is.