There is a separate category for heavy vehicles, and you do have to have a car licence (I'm not certain about clean). The cut off is 3500kg. Anyone who passed their driving test after about 1997 already has to have extra medicals and extra tests to drive anything with even the potential to be legally loaded to anything heavier than that. Paramedics do, for example. It costs about £1000, and isn't super difficult, isn't likely to deter rich folks, and the medical doesn't include anything which would catch potential epilepsy. I have C1 licence. I do not think it makes me a better or safer driver.
I'm not arguing for them, but do you honestly think if someone passed out in a mini and plowed through a children's party, there wouldn't have been life changing injuries and fatalities?
For context, a Kia EV3 is about gross weight is around 2400kg. A landrover defender, around 2900kg It's weightier, sure. But not exactly 'a tank' as people are saying. A white van is typically 3500kg and nobody minds them on the roads, calls them tanks or says they are potentially dangerous everywhere. I appreciate they are a bit wanky and people don't like them. They scream ostentatious wealth and annoy me a bit, too. But I don't think it's logical to label them inherently dangerous. If you bring the limit down to 2800kg to stop people driving wanky defenders, you impact on plumbers and Amazon drivers and a million other non-wanky folk. (A 'little' van that fits in a regular parking space like a T6 is typically 2800kg GVW) They will add the cost to their prices that non-wanky people have to pay. And who, when buying a 97k Defender, is going to baulk at an extra grand on a special licence?