Chat about Novel Coronavirus - 2019-nCoV - COVID-19

I, like you have used them before visiting a very vulnerable relative but the challenge is that the negative lateral flow test could give false confidence that you aren't infectious and people might then not follow the other precautions (mask, space, high ventilation areas etc.)

Makes sense. But I understand them as being a useful tool if you use them wisely and in the context of all other measures rather than making them useless.