There is method to the madness of GEDCOMpare and importing names on a one by one basis.
it is free, collaborative and yet give some access control (unlike FamilySearch)
Those are the reasons Arnold.
FREE: Any Tom, Dick or Harry can join. Not everyone is as diligent in their research as others. In your journey through Suggested Matches, how many Profiles did you see and thought: "What in the he...."
COLLABORATIVE: When you add your tree to WIkiTree, it is not YOUR tree, it is everybody's. The object of WikiTree is One Global Tree to connect the World, so One Name- One Profile. Duplicate Profiles are the bane of our collaborative effort.And everyone should be free to add viable data to a Profile the original creator may not have had.
ACCESS CONTROL: Unless the Profile you're adding is immediate family, the General De Facto Rule is that the Profiles Privacy Level should be Open to foster the collaborative effort. Anyone born more than 150 years ago or died more than 100 years ago MUST be set to Open. There are some other Access Controls for Pre-1700 Profiles and certain Project Protected Profiles, usually famous or notable people.You don't own your Profiles on WikiTree, you manage them.
All the reason you, as well as I, joined WikiTree are the causes for the GEDCOMpare Utility. In reality, the biggest reason for the one at time is to keep duplicates out. In many cases, a computer cannot make the decisions we can on whether a name being added is the same as an existing Profile. Computer programs cannot make assumptions the way we can. They are ruled by strict protocols in logic, we can make illogical, but ultimately correct decisions. Secondary is to give you pause as to whether the data you have is sufficient to create a good Profile. Is the name of your great great grandmothers middle daughter's possible husband true or just a hint for you to research later. If they're a hint, don't add them.
And WikiTree is really different than other sites in that it has no data or records for you to search except that which is entered by its members. Other sites are where you do your research and the archive you create is secondary. Here is where your archive your findings and research is secondary. So bad data in is bad data out.
So yes, it is not the easiest site to load a GEDCOM file and your view of GEDCOMpare is not uncommon to new members, On the contrary, it is a general rule of thumb, but there are reasons. Even more than I mentioned that you'll see as you further navigate the WikiTree world. To paraphrase Abe Lincoln, WikiTree can't be all of the things all of the people want all of the time. Heck, they nailed the last guy who tried to foster that ideal to a cross.
And with that, stick a fork in me as I am done and heading to bed. LOL