Mod selection is one of the most important parts of building a pack. If, as a pack developer, the mod you anticipated using is not available at the moment, you are left with two choices: wait until the mod is available, or find some other mod that will serve the same purpose within the pack. For your two examples, the developers chose to use RS. This doesn't rule out the possibility that the designers wouldn't have settled on RS in the pack even if AE2 were available. Just because something has happened before doesn't mean it has to happen in the future.
RS was being developed on it's own, not just as a substitute for AE2, but because the developers behind RS felt the mod they wanted no longer existed as they wanted it to. Continuing to refer to it as just a placeholder is disrespectful to their hard work, especially since, as this thread has shown, many other players agree with them.
The mods that separated from OpenBlocks did so because the entirety of the mod was not ready to move forward, and many people wanted the tools they had grown used to (gravestones, sleeping bag, elevator, glider, etc.). Now that OpenBlocks has moved forward, it can be added to future packs, but the individual mods should still remain options for cases where a pack designer decides the bloat of OpenBlocks doesn't fit the theme, but they still want a tool or two.
All this said, your posts do nothing to support the original argument that these.mods should be removed from current packs.