(Basically, it's designed with that as a top goal. Be simple/cheap to work on.)
Traditionally, I think the primary reason to buy US fighter jets at very high prices compared to the non-US competition has been that you also expect to get some amount of military protection back from the US worth much more (like 5-10x more) than that investment. Trump has turned this scheme upside down. We thank him for this.
(I also happen to think it may end up being a good thing for the US. It's cutting off a lot of the money supply to the US military complex. Isn't that a good thing?)
Yes he did. No doubt about that. 3 Billion USD worth arms deal is definitely not the true potential of the Indo-US Strategic Defense Partnership though. It can be so much more! But it is a good start. It can be sped up if US can relax its norms in relation to transfer of technology.
The Rafale deal which India signed was a 7.87 Billion Euro deal [1]. India is going to modernize its defense capabilities this decade and this is the right time for the United States to relax its norms if it wants to be a major player. Especially with Make in India being given a thrust in Defense sector.
[1]: https://economictimes.indiatimes.com/news/et-explains/rafale...
I think Trump succeeded in that. Other than that, I don't think he succeeded at anything, if you can call that a win ;)
One of the better side effects of Trump is that the world has gained by finally stepping away from US reliance... American hegemony is no longer.