MCCC was my first mod and it was sorely needed. i couldn't stand the safe soft padded room that vanilla TS4 is.
First thing i adjust are the days for sims to live in lifestages, from 24 to 96 and adjusted how fast the days go by, even before MCCC i was looking for a way to slow down time.
A few of the woowho and teen limits came away with the mod, and i watched sims thrive with this mod, it really brought another 2,000 hours of play to the game now some of the limits were gone and i can actually enjoy the game at a pace i want to play it, not the way the developers want me to rush through it constantly with no end in sight.
I still run MCCC today, i just can't live without it on TS4.