Maybe you should have started off with a more specific question regarding matching drivetrain component speeds?
Most here (who also frequent the Bicycle Mechanics) subforum have a working understanding of indexed shifting -- the general concept is not rocket surgery; no offense to any component engineer or mechanic here -- but of course there are subtle nuances (e.g., mixing components across different Shimano generations and/or groups, matching cable pull ratios, freehub width, etc.) that only certain members (e.g.,
cxwrench ) have readily at their command. Generally, at least in my experience, most of these members have freely offered their expert advice in response to specific questions.
Assuming you really (1) have years of experience in the engineering field (IMHO, the "the" should really be replaced by an "an", both semantically and to reflect how most engineers would regard their respective expertise), (2) have some mechanical aptitude, and (3) are not afraid to do your own work, could you not have made more progress toward articulating one or more specific questions about what you had hoped to do with your bikes or by upgrading / swapping their components? The fact that you did not bother to do so, and instead posed a broad, open-ended, and rambling series of "questions" while requesting an entire body of "
real world knowledge and experience", has been interpreted by some as laziness.
Yes, this is an interactive forum, and interaction involves give and take.