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The craftworld codex and the AdMech codices(Skitarii, Cult Mechanicus) in their e-book formats were finally updated as of 18th Dec.
And I just downloaded the these enhanced editions to my smart phone via Black Library website.
However, I was very disappointed to find almost nothing had changed in their contents.

For example, the only change I noticed in the craftworld codex was the psychic power generation entry of spiritseer.
The previous e-book version had accidentally copy & pasted farseer's entry in spiritseer's datasheet.
Now it's revised to reflect the correct rules.(generating from divination, santic daemonology, telepathy and runes of fate -> generating from santic daemonology, runes of battle and telepathy)
Other than that, literally nothing changed AFAIK. In fact, the Forge of Vauls section(wargear section) still hasn't fixed the typo on the shadow weaver's profile.
It has S6 AP6, yet the updated version still writes it as S3 AP3, which is the profile of Swooping Hawk exarch's weapon.

I haven't skimmed through the entire AdMech codices, but I have yet to see any change worth updating the entire codices.
On the contrary the Cult Mechanicus Wargear section still hasn't included the explanation of Luminagen special rules, so that there is no way of knowing what it actually does unless you also buy skitarii codex.
Overall, I feel very disappointed with the recent updates. They dealt with extremely trivial issues on the whole(fixing typos), and even than it wasn't perfect.
Surely, must this be another way of showing how GW cares, as a "models company", about models and not the rules themselves?

No, it sounds like gw perfectly showed you how much it cared actually.