Recompress is mostly about repacking the file to save disk space, and doesn't materially alter any of the innards of the file. Decrapify attempts to remove the tags that prevent the content from loading in the game.
Oh okay. The reason why I got confused was as I was looking around with this whole store content issue. I can across someone who supposedly has store content as package files undecrapped which means that store fixes aren't necessary. I always assumed decrap was necessary to allow other programs to access the encrypted sims3pack file. Well, apparently just using the recompress supposedly also unlocks this without jumbling the whole file to the point where certain accessories etc go missing so no store fixes required. But I mostly here about this whole decrap and decrap store fixed when it comes to arrd store content so it did make me confused. Would a sims3pack that was only recompressed work to be downloaded through the launcher or is it here where the decrap becomes necessary to remove some extra encryption?