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lyx is for me one of my favourite and most imprtant software. since the late 1990s i have used to produce many documents which are both professional in appearance and are extremely manageable.
its not just the separation of style and content, its also the very good management of things like bibliographic refereces, caption numbering, and the ability to export to many formats from the xml lyx sources - pdf, word, ps, html (yes, you cn produce excellent websites from your tech docs).
its not just stable and logical - is scalable - give it one diagram or give it 150, it doesn't choke.
i wouldn't be where i am without it - i owe it a lot. its a pinnacle of human progress.