32 bit can use up to 3.5 gigs of ram. Many games upgraded to be able to use the full 3.5 gigs of ram. Not Sins.
Yes, we already know about LAA. Some mods like SoaGE, and Armada 3 require LAA to be run with their mods. However i question whether LAA really does force Sins to use more than 2 gigs of ram, or just sets aside 2 gigs exclusively for Sins to use. Sins is "Hard coded", or built into the game to crash when it reaches 2 gigs of ram usage. LAA patched, or not.
TSOP was designed to make it to where you never hit that 2 gig brick wall. Original Sins, Entrenchment, and early builds of Diplomacy needed that BADLY. People got mixed results running LAA on Original Sins, and Entrenchment.
Stardock, and Ironclad fixed the 2 gig issue with Diplomacy's last patches, and Rebellion. By pretty much using TSOP as a guide, and incorporating their own version into the games. So TSOP is not needed for Rebellion, or Diplomacy. However the 2 gig ram limit is still hard coded into the game. Which is the reason why some mods now require LAA.
I already covered my opinion about LAA on the OT. If LAA works for you then great. However TSOP was an alternative where you did not need to patch the game.
I don't know if people still play Original Sins, or Entrenchment any more. I know i said i would make a new version for Rebellion, but TBH I don't see any point. Since the game is already fixed. Any new TSOP for Rebellion would be just a texture reduction mod. Do people really want that?