[I did 7 Toddlers ages ago, just for a distraction. I was doing a psuedo-alphabet legacy mixed with regular legacy and apocalypse. No rules strictly adhered to and plenty of restrictions changed to make more sense to me. Ended up working the 7 toddlers in (in my head if not on paper) as I decided that they were the orphans of all those zombified Romance sims the Oversoul released its wrath on. The Oversoul doesn't kill kids, and Romance sims are such skanks they would of course have a bunch of ankle-biters on the sly. Risky woohoo, and all that.
I should have modified - I don't actually consider either Legacy or Prosperity challenges. I love to start hoods using the prosperity system (roll for # of families, # of members of each, ages, aspirations, etc.) and then think up stories to fit what I've rolled and whatever I feel like doing (currently 1920s-ish film noir or neo noir or some combination thereof).
I also managed to get 1 of the toddlermania sets into the hood with a backstory (for myself, I never really get around to blogging and I tell myself stories truly just because I enjoy it) and just townified another, but I did Toddlermania 3 times and 7 Toddlers twice so some of them just got dumped. Too many sims.
Half the time, anymore, I don't even pay attention to wants until I notice that they are starting to worry about their aspiration level. My sims have roles to fulfill (Teardrop Isle) or I'm just letting them run amok and amuse me (Prospect Beach) so that I can later make sense of their antics.
Roles to fulfill.. that's a great way to put it. I have backstories and what I've been thinking of as simlife goals (not game goals, the sims have goals) but I like your phrase better. Do you post yours in Made-up Animals? I'll have to actually look in there sometime.
*Tombstone of L&D move-ins are now borked. Noticed with FreeTime. If you use it, immediately save, moveobjects on, and delete new sim, then leave lot and return. Otherwise they wander off until the next time you load the lot.
I gave up and put insim back in to set up my hood. I know I can do everything with testing cheats really, but it's tooooo frustrating to find the parts I need and then use them in ways they work (like don't, for example, teleport in a bunch of sims that are in the bin and then turn them into townies with the in-game cheats. You get dupes and if you aren't careful crash the game because one wasn't moved the way the game wants them to be. I'm very glad insim is being updated. I really need it for that kind of hood.