> They also all suffer from estimation issues in practice. Luckily these constraints set a limit on how much a competent professional can underestimate the project.

Where exactly did I claim these weren't complex services? All I said was that there are more constraints on these services than pure software dev. I went further and broke software dev down into different buckets of complexity to further pare down the argument and concede that some software dev should be constrained enough for accurate estimates.

Dispensing with the straw man, what exactly is incorrect about my comment?