I would add that if engineers/developers are unwilling to ask team members for help you have a big problem with the team, likely a recruitment or culture/leadership problem, not just a project management problem.

Teams work best together and to work together egos need to be checked at the door and people need to trust each other. Any problem on a team is the whole team's problem, and while one person may be accountable for introducing bugs, a good team will view that team mate as valued and capable and perhaps pitch in to mentor or help fix the problem quickly.

The Five Dysfunctions of a Team obviously points out a lot of what I am talking about much more elegantly than I can. What I am saying is that project management can only go so far, team leadership, culture, and recruitment is also hugely important to fix many of the problems you identified in the article.

Great article though, I shared it with my work-mates :)