So was league easier to win in 1999 or 2011? Without checking Im sure we had more points in 2011 than 1999.
Each season is different, if team is getting more points but end up in similar league position, it might be because teams above them are also good or the bottom teams are even worse who just give up points with ease. So easy to accumulate points.
So no, points across seasons shouldn't be compared, if we do that we will end up saying 2011 and 2018 are same and better than 1999. Every season should be considered as stand alone, league position says their performance relatively to other teams, which is the most important metric if you want to be black or white and don't want to see any other metric.