This car should be celebrated for what it is rather than criticized for not being an E39. The fact of the matter is, this car is far superior to the E39 in many ways. Many will view the E39 through a nostalgic lens, so try to imagine the G30 launching circa 2000 as a contemporary of the E39.
In terms of SG (and I like SG), these guys definitely gravitate towards analog, visceral cars. Mark has owned multiple S2000s and they refer to the 86 as "the car that started it all for them"
I have owned many of the celebrated E series cars, including several Ms, and currently own an F80 M3 and an F87 M2 comp, in addition to my 540. So I get that the 540 is not as edgy or sporty as cars like those. That said, I enjoy the 540s powertrain, refinement, and interior - and find it light on its feet for a car of its size (it weighs the same as the new G80 M3!). As others have said, if you want something a bit sportier, check out the M340. If you want something more analog, in a sedan format, probably better check out something else. But for many, the G30 is a car they are going to be very happy with.