Wikitree software supports the idea of two kinds of families, Connected and Biological, which correspond to Connection Finder and Relative Finder, respectively.
The reason for having a Mission Statement and Honor Code is to ensure that we, the developers and users are all on the same page. When making decisions as to how to proceed, we should both consult the mission statement and honor code for answers.
The Mission Statement is
"Our mission is to connect the human family on one tree that's free and accessible to everyone."
This means given a choice to be on Relative Finder or Connection Finder, we choose Connection Finder. Just as there is no Biological Connection between Spouses, there is no Biological connection between Adoptees and Parents but they appear as connected. Given the current implementation, the parent should be the Connected Parent.
The top priority in the Honor Code is
"We collaborate. When we share ancestors we work together on the same ancestor profiles."
*This means we do not create separate profiles.
The next Honor Code priority is.
2. We care about accuracy. We're always aiming to improve upon our worldwide family tree and fix mistakes.
*This means we enter all the DNA tests for everyone we have obtained permission.
Using the current system, Adoptees should add "Adopted" to the DNA notes.
The Developers should presume that this is what the users are going to do and design the system to support this.
There seems to be some implication by the way Wikitree presents information. Users seem to presume that the name of a DNA tester on a profile supports the relationship between a parent and child. It does not. In the current implementation, it merely a statement of fact indicating that this DNA Tester is connected. It's presence on the profile is not in itself evidence.
We should presume that some DNA test comparisons may result in "NO Relation".
In these cases, there is no way to narrow down where the connection is not biological, except in the case of parent/child relationship. We should anticipate these types of connections may take years to resolve.
Personally, I would rather know about the DNA comparisons that indicate some problem, than to know about the DNA comparisons that indicate the tree was correct all along.
edit:
This also means that I believe the help on the Adoptions and Multiple Parents page contains an error because it contradicts the Honor Code.
Specifically...
For private profiles with direct connections to living people, the family can choose which parents to include. Note that if the adoptive parents are used, [all] DNA tests should not be added, [even] for the adopted children.
The words in [] should be added.
The context in which the text should be stated is from the profile of the profile being updated.