Something like 1 in 6 people in the uk have no savings
A large chunk - over 1/3 iirc - have less than 1k
So a large proportion of people simply could not buy even a banger outright.
Many who could buy a cheap second hand wouldn't for various reasons - required for work, long commutes, space, adapdations, preference for newer/particular type etc.
There is also the level of risk; on average maybe it works out cheaper - but there is a non-trivial risk of a huge repair bill with an older second hand car.
If you are in a position of borrowing to acquire then often it comes down to a question of monthly payments
- leases can be very reasonable if you are flexible about which car, as there are often cars which manufacturers want to get on the road. My last lease was a brand new EV, had it for 2 years, 1 month upfront, £250pcm. Was worth about 33k new - they depreciated like a rock and a 2 year old was worth £13k when I handed it back. Not my problem. And it cost me literally zero to run.
-pcp comes with a balloon payment which lowers the regular payments - can work very well if you like to change cars so know you will never keep it.
- HP has the right to voluntary terminate after 1/2 is paid.
The handback rights with HP and PCP offer you protection from value loss if the market shifts
Intetest rates are almost often lower on new vs used, often less than half. May be lower than you would earn on savings. This can mean if you are financing and focused on payments its often not much cheaper to buy second hand.
If you buy on finance they have responsibility if the car turns out to be a pup (ditto credit cards, even if you can buy outright pay the deposit on a credit card)
Lots of people have EV salary sacrifice schemes through work which are tax efficient.
There are a huge range of factors which should be weighed up when choosing how to fund a new car.
But then as a previous poster put it, this post is mostly judgement disguised as curiosity.