Brandon
Chassis weight may not seem like a big thing but if you can be lighter than the other guys irl than it can mean a lot as your engine doesn't have to work as hard to get you going and it can lead to faster speeds than other cars who have drivers who weigh the same but their car is heavier. Even the smallest things can make a huge difference
Yes, but in F1 the weight is reglemented and after the last rise any manufacturer who don't have to cut corners because of budget should be able to meet it. So the only effect of lowering chassis weight would be the ability to use it elsewhere to make things stronger or place it as ballast where it benefits the car the most, but you won't have a lighter car.