As an ex designer of Fallen Earth I can say this simply is not entirely true. When your on a team of people for a project you already learn everything from different engines, computer engineering is also important to learn while going to college when you learn how to code and design games. Especially if your working on a team with engineers who coded their own engine from the ground up. That is one of the requirements for even getting the job. The only time I ever saw developers who didn't know how to troubleshoot their own projects was in the independent development field because some of them were young, not very experienced or didn't have a degree.
The SWTOR team from day 1 Dec 20, 2011 - now in 2020 always left things out in the game, especially a lot of the codex entries even when the game had the resources and time to fix them. I doubt it had anything to do with money at the time, but more too do with things that were more important to them. Today it could be used as an excuse because this project is not bringing in a lot of resources for the company to further the productivity of the project.
Overall Bioware never had the intention of ever fixing everything or filling in the missing content that was supposed to be there, to begin with. The bug report system would of been there piling up and they simply ignored them. Even as a designer myself I know It doesn't take 9 years to fill in content that was supposed to be there at release. If they did they would of done it by now.