English has dominated the world for centuries and has become the most succesful language in history. So why are Germanic languages called that? Germany is a shithole that had maybe 50 good years as an empire (60 if you count Hitler). Nobody even knows the etymology of German. I propose that the word Engloid replaces Germanic in all meanings from now on.

my Teutonic Knights are gonna kick your ass

England is like Byzantium in the 1300s now. I propose the word Americoid replaces Germanic. Since most English spoken throughout the world has been Americanized.

For a more serious answer (to what's probably not a very serious thread): while English does fall under the header of "Germanic languages" it's sort of a weird outlier in that group with heavy influences from other groups (particularly Romance languages thanks in part due to domination of England by French nobility for a while). Even as a Germanic/Romance hybrid it has some weird features like a de-emphasis of linguistic gender that's still ongoing (the adjectives blond/blonde used to be a gendered distinction and that's why there are two spellings, but few English speakers nowadays seem to know or care).

I don't know the exact justifications linguists use for the breakdown into the groupings that are used, but most "Germanic" languages are more similar to German than they are to English, so reclassifying them as some category of English-like would generally not be as accurate.

If you want to say that English is weird enough to be in its own category then eh, sure, I'm not going to be the one to stop you there but I'm also not a professional linguist.