[rramadass]

Two main reasons;

1) Power/Politics - This is basically Human Nature at work and institutionalized as Management/Leadership/etc to put themselves at the top. A lot of it is BS (see the books by https://jeffreypfeffer.com/) but unfortunately only the enlightened in the industry have woken up to this. It is also the case that in these domains many of the objectives are intangible/subjective and difficult to measure thus allowing the actors to create an illusion of "Importance".

2) Nature of Engineering - The output of any Engineering activity has a well-defined boundary. This makes it more tangible/manageable/measurable and reason about. All the main costs are paid upfront and once gizmo-x/software-y is done the recurring costs are generally pretty low. This gives the illusion that the Engineer is now not worth his pay compared to his current output and hence replaceable/dispensable based on bean counter calculations. It also doesn't help that Engineers do a pretty good job so that a product/software once released and accepted in the market is generally very stable and not in much need of rework. This is the reason "Planned Obsolescence", "Subscription Model" etc. were invented by the Industry.