For many, there is simply no need to do the maths, because the answer is so very obvious.
For many more, there is no need to do the maths because it would give them an answer that they don't like...

Strangely, they always seem to decline the opportunity to prove me wrong when I challenge them. I'd have thought they'd want to put it to bed once and for all, don't you? (...what with it being so very obvious & all...)
For many more, the adoption of an electric vehicle is simply not practical, due to range, options for charging, and/or cost/difficulty of charging.
Yes, and I have genuine sympathy for those with genuine problems in that regard. You may have noticed that I've never once challenged anyone who (genuinely) can't charge at home yet. That's why sales of new ICE cars aren't being banned tomorrow...
I used to drive some astronomical mileages, back then, even a modern EV simply wouldn't have been close to a practical option.
I know you seem to have an aversion to actual numbers, but "astronomical" is a somewhat subjective term. Munroast says he does 3,500 miles a year. Maybe to him, 10,000 would be "astronomical"? For various reasons, I'll probably end up doing 25,000 miles in an EV this year...
Remember - the government, even energy companies are heavily subsidising EV's, to encourage take-up. In the fullness of time, that encouragement will end, and then the adopters will be facing the real cost of EV's.
I'm not sure about the government subsidising - never mind "heavily" subsidising! It's knocking £2,500 off a limited number of cheaper EVs and it's fining car manufacturers £12,000 PER CAR over its EV selling target. If anyone's subsidising anything, it's the car manufacturers! The government is also reducing the tax on EVs as company cars... (whilst at the same time, making them subject to VED). It has always done that to incentivise uptake of technologies that private sector companies and individuals are too short-sighted and greedy to invest in. Presumably you disapprove of it charging lower rates of VED for some of the oldest, filthiest diesels still on the road too?
Meanwhile, I wonder what it's going to spend on clearing up after the wildfires in Yorkshire? Or the inevitable next round of floods?
I don't mind facing the "real" cost of EVs when the time comes. I pity all the whining luddites who have chosen to miss out on the savings, but will end up having to run EVs anyway, in the future
AND pay full whack for the privilege, but hey ho, their choice...