50:50 weight distribution is a myth unless you are cornering at a constant speed, at a constant radius, then it will allow for constant grip and constant traction on all four corners however, when your driving your not taking corners at constant speed or a constant radius, because your deaccelerating into and accelerating out of. Therefore RWD with a slight rear weight distribution is optimum pivot point, as it allows for optimum weight distribution when braking and cornering, which is one reason performance race cars etc opt for rwd with slight rear bias weight distribution.
Older cars like the 911 & Capri had too much rear weight bias, which were more prone to oversteer, in a similar way a fwd causes understeer. The dawn of more modern computers in cars also aids with traction and stability, something older cars lacked or were more basic.
Most of BMW’s rwd have a 50:50 weigh distribution, but they are still crap in the snow, having wider rear tyres doesn’t help matters, but what an EV has on its side is weight however, that doesn’t distract from the fact a fwd or rwd car on proper season tyres will perform better than any 4wd or EV on summer tyres.