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DivinylsFan  The idea behind the original .package file is to speed up CAS loading, and the point of the MC compatibility file is to fix the known incompatibility with MC.  I don't know what they do on a modding level, but I do know that the MC compatibility file was ineffective enough that Lazy Duchess removed it.  And the original triggers the occasional crash and some other issues that show up in scripterrors.

The Bin files increase the number of tasks per second (TPS) the game can process overall, from the default of 30 to whatever limit you set (500 by default).  This applies across the board and, as far as I've seen, doesn't cause any significant issues on any system strong enough to run Sims 3 in general.  I've been using it since about a month after release, in 2021, and seen significant improvements and no problems that required any special effort to fix.

The .package files were supposed to be an enhancement to the existing improvement to CAS that comes from the faster loading you get with the increased TPS.  It just hasn't worked out that way.

When I said ET, I meant ErrorTrap.  And none of this has anything to do with the Alder Lake issue.  The only connection is that Lazy Duchess created a patch for that too, one that is no longer necessary on EA App installs after the January 13 update.

The patch wouldn't have any effect on how Sims 3 itself runs unless someone was previously using a different workaround to fix the Alder Lake issue, one that DOES tank performance if applied incorrectly.  Then once they didn't need that workaround, they wouldn't be accidentally tanking their performance.