Good observation, it's challenging to solve these problems, here's how we are going about it -

To reduce false positives - we run the same request twice to eliminate flaky fields in response like current timestamp, mock the downstream dependencies as they behaved in prod env and are providing options to ignore / modify the sampled requests

To make integration easier - we are building on top of opentelemetry which has seen remarkable increase in support across languages / frameworks, which makes it easier for us to support different tech stacks.

Regression testing - our primary goal is to provide regression tests. We have come across two type of teams where this makes sense - companies with low test coverage and companies which high number of micro-services as they find it hard to cover every production scenario in tests