In the UK, statistics are collected on the ethnic origin of people in order to provide insights into important issues. For example, the COVID-19 pandemic has revealed that deaths from COVID-19 are higher among black and South Asian groups. Without these statistics we might not back have identified that these communities are more vulnerable to COVID-19.
Another example: statistics have identified that South Asians have a much higher incidence of diabetes. That insight means health professionals can research why the risk is higher in those communities.
Statistics that capture ethnic origin can also provide insight into issues of inequality, health, employment, housing and more. In my view, capturing this data is important and helpful. Without it, insight and analysis will be incomplete.