Queen of Restarts, here. Generally, it's something that totally throws my overarching plotline off of the rails. Sometimes, it's getting a new Pack, such as when Parenthood came out. I restarted with the same Sims once I realized how hard it was to teach Teens values. Better to start them off early. Other times, I lost a key Sim to death. Still other times, when I got wild & crazy and decided to experiment with a new mod. I even set up two saves with the same Sims just in case. :open_mouth: That was a huge disaster. In save A, the only sister was abducted from Uni and although her second older brother was a Rock Star of some fame and totally rich, he kept having to pay the ransom and they got no closer to saving her. Seems there was a bug in the mod! In the alternate save B, the mod kept randomly killing my Rock Star and systematically went after his brothers. I uninstalled and started all over again.
Still another time, a couple of kind-hearted players put me onto the way for my Rock Star to earn Accolades for his music! This was worth starting all over again. This save wasn't without it's troubles, however. Turns out the much preferred three-week season was behind the glitches in the Starlight Accolade Show, that sometimes just wouldn't happen. I reluctantly removed it and went to two-week seasons, instead, after starting all over again. Things were going well, but then MWS came out. I wanted my Rock Star and his wife to have the wedding I could never give them. I have that one saved, along with the one where he earned 17 Accolades. (For this one I'm waiting until the Road to Fame mod is updated.
The wedding finally happened, but again, not without glitches. The one prior they did the full slow dance for which I have pictures. In the current save, I've dubbed REDUX, things are going reasonably well. I'm up to Uni, although I've only written and posted through their honeymoon.
I've gotten this family (in the past) up to their six children before things went awry. All of these later attempts are just to get back to that point. Patches are my enemy despite making copies of the save and doing what we're told to do to safeguard it.
But, I'm having a blast!
Don't worry about your restarts. It's a lot like writing a book. If a chapter goes in the wrong direction, you simply rewrite it until you get what you need from it. At least, that's how I view it.