I suppose making mom fall in love with dad and then have five five babies can only stay interesting for so long. I don't think the Sims 4 is to blame, it's just that imagination is no longer sparked the number fifty time you do the same thing. We all run low on inspiration doing the same thing over and over. I don't see many Sims 2 or Sims 3 youtubers either. It's because those game had their run. It's just the natural course of things, and Sims 4 has been around for many years now. It's that time.