Yeah you generally don't know how durable or good a model will be until it's ran for a year. How long the lifetime of the equipment is completely unknown. Estimating failure rates is incredibly difficult because it depends largely on environment, but also quality.

A good portion of the world doesn't have the repair infrastructure the US has. The warranty is pretty much useless in most countries, which requires sending units back to China/US to get repaired which makes it really difficult unless you are operating at scale and can do repairs yourself.

Mining is a major headache