Mandating certain health requirements - which may include vaccination - for healthcare staff (and for staff in some other sectors, too) is nothing new, terrifying or revolutionary. I can totally understand, though, why Germany as a federal government would not wish to mandate healthcare procedures, or legislate for sanctions against those who refuse, or who are unable, to comply with recommendations.
Those healthcare workers who are unable, through no fault of their own, to fulfil recommendations or requirements for infectious disease protocols are - at least in my personal experience - assisted in finding a different direction still within or close to their field of expertise but which has health requirements more appropriate to whatever the issue might be.
Finding different and appropriate posts for healthcare workers who cannot, for good reason, have a C-19 vaccination, will be a lot more difficult than finding an appropriate post for someone like me who was merely a rubella vaccine non-responder, and I believe those individuals who cannot for good reason fulfil the requirements deserve more consideration - and IMO 'first dibs' at the (probably few) suitable jobs - than those who merely choose not to have the vaccination for no good scientific or medical reason.