I've edited to more closely conform to your preferred template, and to hide the clarifying discussions from folks who are afraid of words. :) As is hopefully clearer at a glance now, the meat of the proposal is really not long or complicated; all the clarifying definitions and examples were only ...

I realize that my attempt at a thorough explanation of the suggestion got a little wordy, but I don't think it's that complicated when you break it down into its component pieces -- all it comes down to is recognizing the four levels of similarity/difference between what the player is trying to ...

TL;DR
Building in ghost-mode and placing blueprints should be able to upgrade or convert similar existing entities to more closely match the ease of use of direct building.

What ?
When ghost-building, cut/copy-pasting or placing a blueprint on top of an existing ghost:

Always allow upgrading ...