Like how you mentioned galaxy alpha and not galaxy s5 or even galaxy s4.
Galaxy alpha is a budget phone so of course it is not going to have a top of a line screen.
No, It's marketed as a premium phone, to compete with the iPhone 6. It is far from a budget phone; it costs £500 unlocked in the UK and $600 in the US.
It's the design Samsung has focused on- something that will help it compete in the premium market with Apple's upcoming iPhone.