Many (if not most) domain SLD are a brand, a slogan, or a product name.
Considering that many urls are found by search engine requests (that are thus no type-ins), IMHO type-ins are probably far less in percentage as is tried to make believe.
Who does not know the url of the wanted online entity, must search for it = Is no type-in.
Who does know the url, types it in - But that only means that this one person knew the url.
Type-ins are IMHO not a really relevant argument to buy a given domain.
But well-dressed arguments can be very convincing.