Being a banker isn’t any harder (in fact, much easier) than being a doctor/nurse/carer/teacher etc
We have some of these careers in my family. The banker works far longer hours (18 hours a day 6 and a half days a week) than the doctor. The banker has no job security (instant redundancy is the norm), no automatic career progression and is the object of uninformed hate from many in society (cf this thread). Additionally they work in a pretty toxic environment and they either get measurable results or they are fired. If they succeed they are well rewarded. Most leave after a few years as the pressure is unsustainable.
For those moaning about the demographic, the jobs are open to anyone with the right skill sets who applies. As things currently stand “diverse” applicants are preferred over white men. But most people would not dream of applying for the reasons given above.
Medicine, nursing, caring, teaching etc are different jobs which require different skill sets and are rewarded differently. If people in those jobs want the rewards of banking then they should apply for banking jobs - and if they are successful, they can put in the hours, deliver the results, and reap the benefits. But there are no weekends, evenings off, long holidays and people clapping in appreciation on their doorsteps - and no nice coffee chats at break time.