Back in the day the idea was that EVERY SIM title could potentially integrate.
So. Now. I just had the absurd vision that would allow ANY sim created in 1-4 or any other SIMStitle to be imported and exist in the same SIMS4-5 world.
They could look the same as they do in the iteration they come from ( Or. Get a conversion upgrade skin ). Making it easy to identify what version they came from; what traits, abilities, etc. they might come with to flavor, supercharge or degrade your SIMS4-5 worlds.
Some careers might not be possible to reach the top and supercharge a world without; say a, SIM from an earlier version that has a TARUS starsign and X Traits/abilities.
Importing a MEDIEVAL SIM into your world, for what reason? Does there need to be a reason.
I personally miss my perfect robot, band, family from days of yore and would like to bring them into SIMS4 and show these new servos a thing or two. Pfft! :)
This is only brainstorm stuff and might seem like hell to the next set of eyes. That's brainstorming though.
Cheers and Best!