It kinda is the house as well. Before EVs, the electric shower was the big beast in using electricity (~9 or 10 kWh) but you'd only use it for 10 mins. The cooker or the washing machine might be next but they'd only be around 2 or 3 kWh (I think) for an hour or two. In other words, most energy use was sporadic and it was hard to overload the fuseboard. So if the shower (9), plus the EV (7), plus washing machine, computers and a few tellys were all used at the same time, you might trip the main fuse.
Also, with EVs, you'd be taking 7kWh (or even 11 with the newer EVs) for a continuous 7 or 8 hours at night. That puts extra pressure (heat) on the wires in/out of the meter (meter tails) and they could melt and set your house on fire if the tails are not thick enough. I think 16sqmm is recommended nowadays for the tails whereas a lot of houses (well, mine) have only 10sqmm. 10sqmm is ok for a house with electric shower, washing machine, tv, etc etc but not for an EV, or so the electricians say. In my case, ESB Networks will upgrade 'their' side of the meter for €170... The electricians want €14,000 to upgrade 'my' side of the meter by rewiring the entire house! But I'm not bitter

I'm not an electrician so E&OE...