Problem: many people don't like taking the afternoon off work to attend a 5 minute GP appointment. many appointments are simply catch ups or prescription renewal that can be done over Skype, clearly not all.
Additionally, many people don't attend their appointments, a particular problem with less than 3 GPs in house.
Convenient access to NHS services via app can be great for some patients, having pools of hundreds of available GPs helps balance workload, and may even be immediately available. You also wouldn't need to leave the house to get a repeat prescription
Some doctors will hate this, as it will be in direct competition with their multi million pound clinics, and may even lower the barrier for specialist sexual health nurses to take over swathes of work that a Dr could make an easy living out of