Observation of TS4's depth
While TS4 is still lacking in a bunch of areas (mostly the sims' individuality with traits/likes etc, reactions and family play with life stage differentiation), I have observed that TS4 does actually...
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TS4 seems more 'spammy' though - individual 'talk' to a Sim are over very quickly - 'deep conversation' is like as quick as asking them how their day is going. So, I find that I have to keep tabs - in TS3 the individual 'talk' items took longer, based on what they were. TS4's balancing of the amount of time each interaction takes seems to be to push towards the group chat feature (which we really cannot control - the Sims take over).
