Apple always behind? I see the opposite. And those areas of functionality that would potentially harm the user experience are thought through and time taken, to learn from others mistakes, before implementing.
I for one am glad that there is a strict approval process. I don't want any crap to be accepted, when I hit download/purchase/install I want to feel safe in the knowledge that standards, security and stability are not compromised.
and yet it's not uncommon for patches to apps to appear within days of a big release to fix "stability issues"