Have you not heard of Trump promises to increase funding for defense programs several times? What has changed? Trump makes decisions that do not conform to logic. He's a threat. I'm not a supporter of Hillary, but would be better if the President was she.
Trump has promised to cut-down wasteful spending, including the $1.5 trillion F-35 project. If such unnecessary spending is reduced, then there will be more than enough funds for the new defense projects.
No, there is no such thing as "best aircraft."
For it's mission profiles, is it the best?
Nope.
Should it be criticized?
Yep.