Two comments here.
One, I'm probably less comfortable with a category like "Indigenous mapping" than others (including, perhaps not coincidentally, some who identify as Indigenous). To me it seems to have both the plusses and minuses of pan-Indigenous politics more broadly, making connections and a collective voice but also flattening the diversity of Indigenous practices, cultures, and political goals. It also seems historically specific, emerging in the late twentieth century as part of the politics of the late twentieth (and early twenty-first) century; it's not a neutral description either of historical or contemporary practices. The idea that cultures and practices as diverse as Marshallese stick maps, the Relaciones Geográficas, and the oral history of communal hunting grounds should be unified as "Indigenous mapping" I think does too much to create a binary between Indigenous and Western/modern/etc., precisely in all the ways that this kind of binary is problematic. I think it's more powerful—both analytically and, beyond the specific goals of pan-Indigeneity, politically—to rather see different cultures and traditions as in fact quite different and not to collapse all differences into only two options (settler and Indigenous, modern and traditional, us and them, etc.).
Two, one of the main thrusts of recent scholarship on cartography is to argue (successfully, in my view) that all mapping, not just Indigenous mapping, should be analyzed as process. (Edney's recent "processual" approach is one example, but there are many others before him, going back at least twenty years.) I also think it's just incorrect to say that mainline mapping, even from the point of view of its own practitioners and institutions, is not interested in process, relationality, temporality, or human geographic experience. So much of mainline mapping is concerned with precisely these issues, even (especially?) in cases where maps are deployed as tools of management, control, and expropriation. There's also a lot of genuine diversity within mainline mapping—navigational charts, school atlases, and cadastral maps are all quite different in conception and in practice, and collapsing them into a monolithic whole can easily lead to errors of analysis. (Or, put another way, I see a contrast here between the care and nuance of your reading of Indigenous mapping with the somewhat overbroad and unevidenced characterizations of mainline mapping. There is no single "logic" of mainline mapping, just as there's no single logic of Indigenous mapping.)