My experience has been that this isn't limited to engineers. I'm sure most people here have had people from other departments tell them how they need to do their jobs in one way or another.

For example, there are always at least a few people who you have to consult regularly because their tickets are always written how they perceive a problem should be solved rather than explaining the underlying problem to be solved. Then there are the sales and marketing types who like to dictate how the UX of the front-end should be because they like to retell anecdotes to prospective clients about how they solved a problem. Then there's the guy who hands you a spreadsheet he's maintained for years and tells you he wants you to put something exactly like it in the flagship product as a new feature.

Well, if I'm systems engineer and everything that exists can be modelled as a system...