To have said getting a 19 year old a brand new expensive car is ludicrous

If he can easily afford it, I don't see a problem. My Mum bought me a brand new Ford Escort when I passed my driving test at 17 because that was what she could afford. I loved it and was grateful for it as it meant I could drive to school which was about 12 miles away, instead of catching the school bus!

YABVVU.
Safety - new cars have more safety features.
Logic - what does this even mean?
He can afford it so insurance, damaging etc is irrelevant.

You may have a point about spoiling her but she's a rich girl and not your daughter so none of your business really.

Are you sure you're not jealous that on some level your DC will never get anything handed to them on a plate like that?

One of the advantages of a brand new expensive car is the safety features OP. The clapped out old banger I bought for £450 when I passed my test could go at 100mph (admittedly, 0-100mph took about 3 minutes). I know which car I'd rather be in a crash at speed in! Plus the fancy new car will have collision avoidance systems, which can reduce (but not eliminate) risk.

Where I live lots of kids are given brand new expensive cars when they pass their test at 17. The number of fancy cars driven by red P platers is astounding. Obviously the parents can afford it so their money, their choice. Not what I would do personally but I will never have the choice so try not to judge others. I really wouldn’t make this a sticking point with your DP, you will just come across as jealous and if he has to choose he would rightly choose his child.

YABU to even try to influence what he spends on his daughter. If you are genuinely concerned about her safety and the practicalities of lugging sports kit around, you could always suggest DP buys her a Range Rover.

I could drive my second hand Fiesta over 100mph if I wanted to, and fatal accidents happen at lower speeds too, so no added danger there.

And with enormous wealth they clearly don't have to worry about damage or insurance.

Logic doesn't really come into it.

So that's your concerns dealt with OP.

Now, about your jealousy......

Enough cars in the sports team makes a huge difference. I travelled all over the country playing sport for the university and I do appreciated the parents of my team mates who had bought them cars (I didn't learn to drive till later). So given the hobby it seems a sensible use of money. It's quite hard to be very spoilt and play team sport at a high level, it shapes you as a person. I learnt more useful work places skills from the sport than I did from my (very highly regarded) degree

I love "rust fund" - saving up for a used car for your teen

I think you're slightly BU op but you make up for it with this delightful typo

I wouldn’t, even if I had the money, because there is value, in my view, to not having everything handed to you on a plate. That said, just because I wouldn’t, doesn’t make it wrong - his money, his choice.

Well...you are judging his parenting, aren't you?

It wouldn't be my choice even if I could afford it - but it's not my money and not my daughter.