My spouse is in healthcare, and at least in the US, it seems to be a similar situation.

There’s a big medical structure. And in theory, there’s lots of folks to deal with XYZ. In practice, docs need to do YZ because they are the ones who have the right combination of training and authorization to complete the task. When more people get hired, the doc just has to communicate YZ to more people. Either the task requires nuance that is missed if you’re not the doc, or the task requires direct doc authorization at various points regardless. Doesn’t decrease their burden at all, even though there’s more people working on YZ.