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I suppose metrics are the consequence of an increase in choice. Today everyone sends and receives hundreds of requests, applications, offers. The only way to manage this amount while still being ‘fair’ is a simple metric that everyone can understand and quickly calculate.
1/ I think you’re right about the underlying driving force- an attempt to cope with complexity. But I don’t think it’s working in a lot of cases. Not just suboptimal but worse- we think we’re helping things when we’re actually making them worse.
