As a Wikipedia reader I want to be shown as an option a list of article authors directly in the article itself.
See
https://de.wikipedia.org/wiki/Wikipedia:Umfragen/Technische_W%C3%BCnsche/Top_20#Einblendung_der_Autoren_direkt_am_Artikeltext (in German).
Further details:
The determination of the authorship of individual words (in wikitext or in the resulting html) would be very costly from technical point of view and can be implemented only with a long-time commitment from the WMF
In the long-run it would be theoretically possible to display the authorship directly while editing via VisualEditor
Native "Blame-Tools" could be integrated in a better way with a relatively small effort. However there is a danger that with a bigger visibility the negative impact of the misleading results would be to severe.
Effort:
Needs to be further discussed with: within the German Community itself (needs to be further specified e.g. visible for all or only logged-in, distinction between major/not major authors, how bad would be a false attribution etc.)
This is part of the Top 20 wishes of the German community