It just takes time. Xbox One and X360 are going through the same thing where XBO doesnt have a lot of features X360 did. And with every update more of those features come back and more. PS4 will be the same way. In about 5 years both PS4/XBO will not be the same as they were in 2015.
As for games, PS3 has been out for 9 years so of course it will have more games. But PS4 will also have more games than PS3 released from this point forward