TSLRCM tries to fix to the best of our abilities the issues The Sith Lords had due to being rushed. Containing a host of restored content and fixes many bugs left inside TSL giving you the most polished and best possible chance to get the full experience.
Apparently, aside from adding content, earlier versions of TSLRCM also took a bit of content.
Incorperating Kreia/Jinger's Rebuild Dantooine was good (since it was good) however suddenly all remaining masters dropped dead when confronted. Instead of having to do battle as in vanilla TSL.
So, with 1.8, with the additional kreia content, you still have to do battle with the remaining Jedi Masters just as in vanilla.
I certainly hope that was the only bit of content that got lost due to TSLRCM 0_0