Why does starting a new save force you into CAS?

I really dislike that too. Creating a character from scratch often takes too long, and in sims2 and 3, I like reading bios and delving into the interwoven backstories of pre-made households.

Having to make a sim from scratch slows things way down and makes it too heavy a decision. I rarely ever want to play some insertion of myself. I want to get wild and silly with the premades because there's so much there to explore and have fun with and I can jump right in!