For human faces (and vanity), often a 'less-than-excellent' lens might be desirable. I have an 85/1.8 K/Ai that's already too "sharp" sometimes.
You are right, and therefore I don't like (105mm) Makros (Zeiss Makroplanar etc.) for portraiture. The - for me - best portraits are seldom ultrasharp.
For me the most desired portraiture-look (strong unsharpness in the background / 'old-style medium-format-Bokeh' ...) needs either at least 85mm/105mm f/1.4/1.2 (135mm f/2; 200mm f/2.8/2.0) OR true analog medium format (s. the photos of Stephan vanFleteren:
https://www.stephanvanfleteren.com/artists [he often uses an old analogue Hasselblad]
But to make a sharp eye/face softer is easy, but to make a really unsharp face/eye sharp is impossible:
Nikon D850, Nikon Nikkor 85mm f/1.4 Ai-S; 1/400 sec; ISO 560; Bl. 2.8
Unsharp (simulation of an old glass plate):Standard (profile camera-standard):