I'm not talking about bad treatment. I'm talking about hard work.
But 'what to do?' is easy to answer in principle but hard to implement in practice: lower barriers to entry for new companies, and for companies wanting to expand into other industries or markets. Make it easy for workers to move between jobs. (By, for example, not tying health insurance to your job.)
While i'm not working there, i casually know some people who did at the store level, shelving/cashier. It's not less hard at f.e. Edeka or Rewe either. That's what i meant. And health insurance isn't tied to a job here. And when you are shopping, if you are not absolutely ignorant, you can see and compare the range of tasks a single person has to do where and when. There is not much difference to be seen, and backstage it isn't different either.
edit: I'm unsure what you mean by lower barriers to entry.
I'm all in for barriers if they ensure following safe and healthy practice!
Oh, I'm more comparing to American supermarkets. They have much higher staffing levels than what competition with Lidl and Aldi has forced the German retail landscape down to.
(Btw, 'for example' is spelled e.g. not f.e. in English. And German 'd.h' (das heißt) is i.e. in English. They are curious creatures and have a thing for Latin. Most people still pronounce eg as 'for example' and ie as 'that is'.)