I work in a fairly toxic work environment.
The reasons I do what the engineers are doing are,
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A lot of times people will ask me questions and I give them answers. Then something will go wrong and it will somehow be my fault that I didn't mention it to them (they didn't ask, and I don't know the specifics of what they are doing).
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I have my own goals and projects for the year. Why should I give you a significant amount of my time when my salary/bonus will not reflect helping you in anyway.
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Job security.
These might sound bad, but that is how it works in corporate America
Edit: It sounds like you need management on board with you before you can fully continue
For me it updates frequently and changes a lot of little things (like button placement, or defaults) that just don't need to be updated.