I feel really bad for the guy I'm currently working with. I have until roughly the end of August to upskill him in every aspect of 3 different iOS apps because once I move to a new project he will be the entire maintenance team for those apps. Feel like he is getting shafted so badly. The whole process has been poorly managed. The managers don't care how well I train him as long as it doesn't take too many man-days. And they are expecting that they can still pull me back in to help if he gets stuck even after I've moved. Starting to feel like I'm being taken for granted. Can't wait to get off this horrible project.

So we have spent the last ~3 weeks creating workarounds for bugs that were found during testing against iOS 11 beta 1.
Today I had to go in and undo all the merges because as of beta 7 Apple have fixed the issues we were seeing.
Weeks of effort wasted that could have been spent upskilling or fixing build issues with an app that will have a release due in the coming weeks and we currently know little about.

To those who have worked in mad RAD solo environments, with next to no testing...

...and those who have worked full Agile, with high code coverage, code review amongst hoards of T-shaped developers...

...how much difference does it make to wellbeing and upskilling in the two?

Bonus points if you have done both and can compare in an n=1 way.