Modern missiles and helmet sights have made pure dog fighting less important yes. There is no longer a need for turning into the opponent's 6 to get a shot.
The debate is going in circles in here now so It isn't much Point of be in it anymore but imo the main issues are in
Management and 'politics' - Too many bad decisions have been made, starting production way Before development and testing was done was a big misstake. And a lot of thing is made to create an illusion of the plane being 'better' than it is. Declaring the plane to have IOC even though everyone knows that the necessary software is still a year or so from completion, it is a way to fooling people and i don't like that. If the biggest concern is to make it look good to the public, then what else are they hiding?
A cause of concern is also how the plane will perform if it don't have the stealth advantage. countries like China will counter stealth, both with their own stealth fighters and various ways and also finding ways of detecting it.
It's all about what it can and cannot do when it's finished, and we will not know for at least a few years, my not-so-qualified guess is that we will not see the F-35 truly combat ready in any greater number before 2021-22. until then we can only guess.
But we better hope it works, and soon, U.S Fighter fleet is almost at the Point were they falls apart and a large portion of them must be replaced within the next 10 years and there are no option besides the F-35. All eggs are in the basket..