A two-week quarantine has been a condition of entry in the United Kingdom since Monday. Three airlines are now taking legal action against this.
British Airways, Easyjet and Ryanair have taken legal action against the UK government's mandatory 14-day quarantine. According to the airlines, the enacted regulations would have a devastating effect on UK tourism and the country's macroeconomic situation. In addition, you could lose thousands of jobs as a result.
At the same time, the applicants argue that the necessity and effectiveness of the current measures have neither been proven nor verifiable. The procedure is simply too hard, as you say. Instead, the authorities are asked to reintroduce the old regulations, in which self-isolation was reserved for people from countries with increased risk.