To be fair, modern dedicated servers at hetzner have two power units, and come with a redundand ssd/hdd raid-1 config. AFAIK both ssd and power unit having hotplug capability, so in case either fails they can be replaced with zero downtime.

Given the downtimes we saw in the past year(s) (AWS, Cloudflare, Azure - the later even down several times), I would argue moving to any of the big cloud providers give you not much of a better guarantee.

I myself am a Hetzner customer with a dedicated vServer, meaning it is a shared virtual server but with dedicated CPUs (read: still oversubscribed, but some performance guarantee) and had zero hardware-based downtime for years [0]. I would guess their vservers are on similar redundant hardware where the failing components can be hotswapped.

[0] = They once within the last 3 years sent me an email that they had to update a router that would affect network connectivity for the vServer, but the notification came weeks in advance and lasted about 15 minutes. No reboot/hardware failure on my vServer though.