2 meters is only sufficient for droplet transmission (e.g. breathing). Aerosol transmission (e.g. a sneeze or heavy cough) can travel much further than 2m. Granted these are for confined spaces and outdoors it will depend on factors such as the wind. But 10m sounds perfect.

At the moment we are all isolating for months. So yes if 5% of the population needs to isolate because they were 10m away from someone who had it then so be it. I'm perfectly fine with that.