Comment by Arnt

I'm Norwegian, not Swedish, but AIUI the societal trends were similar.

There's been a trend towards typing ability, yes, but hardly decisive. The old secretaries would do the bulk of e.g. organising conferences or the professor's travel, that's needs typing but not only typing.

The trend (in .no/.se etc) towards equality, against certain symbols of prestige, mattered a great deal. A long time ago having a secretary was a symbol of power, appropriate for Professor Dr. Lundman. At some point forgoing one became a symbol of modernity, and private secretaries became much less common, and the universities reorganised to provide specialised services such as ticket purchasers and maybe grant application writers instead of private secretaries.