as experienced certifying personnel, we know what is go and what is no go. in real life, (forget what regulatory / qa insist) aircraft may not be 100% strict to mel, amm.... everyone of us have our own set of go/no go gage. some people put that at 95% and some people put thing at 85%. it is our own judgement how to navigate through this difference between real life and book rules. this may depend on how well we understand individual systems. if u don't feel comfortable in signing something, don't sign.
commercial pressure - our job is to make aircraft safe for travel. having 400 people eagering waiting at the gate because of a delay won't make u feel comfortable neither. if thing is acceptable, why don't let all people happy making their trip on time. of course the right level of safety should never be compromised.
i'm not management and will never be.