Subjective things like music is hard to nail down though because what you equate to Larian-esque could be considered tone setting and wonderful by others. Hence people have different taste in music as well as art and style.
That's not true at all. I do not know nearly enough about music to make an accurate objective analysis, but I have seen it done repeatedly. You can compare the type of instruments used, vocals, tones, etc. I would absolutely love for someone with expertise in music analysis to compare the BG/BG 2 soundtracks as against the BG 3 music. To me, it subjectively feels like DoS music due to the amount of 'airiness', 'chanting' and usage of harps, lacking the impact of the big brass used throughout BG. But the composer of the BG 3 soundtrack did state that he took inspiration and elements from the BG/BG 2 soundtracks, so I'm waiting for someone with more knowledge to prove if that is true or not.
Subjectively, to me, BG 3 just doesn't sound similar to BG 1&2. There are elements there, but the emphasis and tone seems all wrong. Instead I hear the airy chanting and harps of DoS 2 (but not DoS 1, which does seem to have a unique feel to me), rather than the big brass and emphatic drums of BG.
Nice, I clicked on the soundcloud link the OP made of his version with 5/4 and that tempo really does change it a lot! He only used the section of the intro music that had drums and horns which was closer to the marching cadence I spoke of, but having the tempo change made it more forceful and did transform the music. I have a feeling this would feel unnatural for the other sections as they changed styles a few times through the song.