Is there already a name for that effect where grandiose plans somehow appear to be more feasible than the simple mundane step-by-step issues resolution that even though they clearly stand in the way of said grand plans, are not worth investing thought and effort in?

When it comes to software projects my pet-name for it is the "big-bang theory", but in the article's domain that's kind of already taken.

I use the term "30,000 foot view" a lot: https://nanoglobals.com/glossary/30000-foot-view/

It appeals to me because if you've ever taken a flight you can see how the details get progressively erased as you lift. Details that matter for a lot of reasons even if you can't see them.

"Far-mode thinking".

https://www.lesswrong.com/w/near-far-thinking