A personal view, but I find that body-coloured "fake grilles" which are quite common look cheap and plasticky. The Kia e-Niro, otherwise an attractive looking car to me, is ruined by this - only the black one (which gets a black "fake grille") looks good.
I agree, the fake grills are unnecessary and can look tacky.
The e-Niro is a different case though, as the current model is on an ICE based platform and is available in ICE, Hybrid and EV versions.
The blanked off grill makes sense in that case, even if the colouring may be off for some people.
There are appalling examples though.
Audi and BMW are hell bent on using bigger and uglier front grills on almost all their models, whatever the power train.
The (full-fat) e-tron SUV is an adaptation of the Q5 platform and the blanked off grill, isn't much different from the functioning grills in the Q5, Q7, Q8 etc.
However, there's no practical reason for the large fake, pointless plastic grill on the otherwise, stylish looking Q4 e-tron.
Worst still, is what BMW are doing.
They've started replacing their signature "kidney grill" on the front of their cars, with what can only be described as a "Baboon's Arse".
Hideous.
The new BMW i4 EV prominently sports one of these and looks all the worst for it.
The flagship BMW iX SUV has an even more exaggerated and totally pointless version of this awful grill style.
Still, no doubt somebody must love the looks.
.