OK but then we also have to come to the conclusion that not everyone can copy that same formula...hence the reason why we are in this era we are now where there are no 90's Tupac and late 90's/early 2000's Jay Z level type albums out in this decade that used that same formula.
That is not why we are in this era. There's a difference. When Pac was recorded all of those songs, the recording process is nowhere near what it is now. Him recording those songs in a short period in the 90's is far different than what it is now. Technology changed everything and caters to short attention spans. You can write, record, mix, master and have the music available for purchase in no time. You can put out multiple albums in the same day. That has nothing to do with a lack of lyricism and everything to do with fear of becoming irrelevant.
In Pac's case, he wanted to leave behind a wealth of music in case he died. Jay did it to be competitive because wanted to make sure he put out something annually.
All I'm saying is that the time it takes to write a song doesn't necessarily affect how lyrical it is.