I run a few stats site for a video game, and the overall hosting right now is ~€220 on Hetzner for a AX51-NVMe + AX61-NVMe + some extra SSDs + HDDs --- so that's the same price as just a AX42-1 in the new pricing model which is insane. If one of the servers goes down I'd need to likely shut down one of the projects or massively change the architecture.

What do you mean with if the server goes down? As far as I know Hetzner will replace tje hardware for free: "Support services include the free replacement of defective hardware."