It would be that, if all goals were equally good and individual taste was the ultimate criterium (which in some cultures are, not always the best ones).
Otherwise not wanting to "devel into a responsible adult" doesn't sound like an issue of "conflict of goals" (any more than one parent being an absentee parent would merely be a "conflict of goals" as opposed to a problem), but a development issue.
At some point, your partners development issue becomes your own partner selection and compatibility problem.
Yes. And it's fine to consider this a problem, and criticize them for it, is my point.
It affects the behavior of the person, and thus others that had to deal with them - including me, if I'm unlucky enough. Societal criticism of bad personality traits is one of the forces keeping societies functional and habitable.
The fundamental conflict is that the person and their wife's goals are not aligned.
If the husband does not want to develop into a "responsible adult" in this respect, their goals are not aligned. A good partner can help the other achieve their goals, but but if there is no alignment on the who one partner wants to be and work towards, this will always be a source of conflict.