On the hardware side of things not using server grade stuff really isn't as big of a deal these days. I'd happily take a decent Ryzen 5 or 7 series over a "new" Xeon that has twice the power consumption and mysteriously the same specs as an older Xeon made a decade ago.
Even ECC - for 99% of applications (and especially on low-end VPS servers) its less likely to be a problem.
The only thing I have found to be an issue with Hetzner is on dedicated servers, and specifically the hard drives. I've had new servers provisioned and they've given me decade old drives that are on the verge of failure - it's less of an issue now as most of their servers are shipping with new nvme drives but I dare say in 3-4 years time it'll be a problem when they reuse those and have instant non-recoverable failures for some of the hardware range.