Right, this'll be just a diatribe I take it, but grille
design theory, they looked at that X-Class concept from a while ago and were confused when people said the X-Class looked like an angry pig, so they made a BMW that's exactly one.
With Carscoops' article stating "
2021 BMW M3 / M4’s Massive Nostrils Can Sniff AMGs From Miles Away", a pretty apt and on the spot descrpition.
But it's also not much of a grille theory without looking at some previous vehicles to see how their grilles worked on them, including the above CSL Hommage
Which, while the CSL Hommage grille
is fairly big, it's also
not so massive that it touches the bottom of the car, and generally has more curvature closer to the lights, leading to a moderately more appealing design,
even if it is still inferior to the old CSL
Though another point to bring up, is that, the 2021 3/4 grille generally, does not match the width presented by the car itself
For example, let's take this old peculiarly-not-a-BMW model
It's a fairly decent design, but the way its nose is shaped is what gives credence to the tall kidney grilles on it, and although the new 3/4 k-grilles are wider, the bodywork of said 3/4 absolutely does not match the design the grilles are going for, and would presumably look even more uncanny, if the grilles were thinner.
But, of course, you probably recall that BMW kept using tall grilles on wide noses, like with the 2000 C
Yet whilst unfitting, the difference between the 2021 grille and the grille presented on the 2000 C, is that it's still more moderately proportioned on the 2000 C but it's also mindful of the chrome trim ontop of it, whereas the 2021 BMW's grille basically indents the area between the grille and the hood to fit it, not to mention the whole lower bumper area
That said, I always tended to see more mentions of the 2000 C's sucessor when discussing cars, especially as the CSL hommage was already brought up here, the E9 series.
Regardless of your preference between the standard or the CSL-like trims, the way they dealt with the wider nose is that, instead of increasing the grille's size, they added extra grilles around the lights up to around the point where the original grille is leading to, if you ask me, a better appearance whilist keeping the BMW essence the kidney grille provided
Furthermore, to me, proportionswise the CSL version's "bumper(?)" being mostly smooth gives a nice contrast to the upper front's grilles.
Similarly, let's also bring the other BMW to mesh the tall-ish kidney grille alongside another, wider grille, but a slightly more modern one, the E30.
Unlike the above EMW, 2000 C and E9 the E30 is the first car brought up that's actually related to to the 3-series sets of cars.
With the mixed grilles of the E30 being a distinct design feature, it'd certainly be uncanny to see one with just the kidney grilles.
Later years of cars, as you probably already know, tended to do away with the tall-kidney-grille+wide-grille dynamic, preferring to instead implement a wide kidney grille, with the E36 and E46 preferring to have wider headlights compared to the grille, or the E90 and F30 cars gave a roughly similar width for them.
The "considerably" bigger grilles before this being reserved for the more opulent 6er and 7er cars, but even on the facelifted G11, you could argue that despite the massive size of its grille, it still fits the front of the car fits better than whatever they were thinking for the 2021 3/4 grille, because the facelift-G11's grille is still wider than it is tall.
That said I'll use the opportunity to say the E63's grille looks haphazard, remove the chrome trim ontop and move it up to the hood
Basically, wide kidney grilles work better on modern cars than tall roughly-octagonal kidney grilles,
or kidney grilles with no sense of space that encroach on the lower bumper area, but I also guess they wanted to Bugatti-ify their designs without being entirely sure how to use the design ethos.