As stated in Cordovan's statement, which you can find
here, the new legendary raid timer bypass hourglasses initially worked for raids of level 31 and above, while the old (normal) raid timer bypass hourglasses were designed for raids of level 30 and below, in line with the information provided by the DDO Store.
However, at some unknown point after U55, this system was altered, and now the normal raid timer bypass hourglasses function for raids of level 29 and below only and the newer legendary for 30 and above.
Therefore, the non-legendary timers were retroactively nerfed, contrary to your claim.
Upon reading the statement
here, it becomes apparent why the legendary raid timer bypass hourglasses where introduced. The goal was to maintain the complete functionality of the old raid timer bypass hourglasses. The legendary version was introduced exclusively for legendary raids (level 31+) with Update 29.
For some unknown reason, the policy shifted after the developers announced that level 30 is now considered legendary, coinciding with the introduction of the new 31 and 32 legendary character levels.
It's worth noting that when obtaining character levels from the epic trainer, he grants epic levels from level 21 to 30. If you aim for levels 31 and 32, he informs you that he now provides legendary levels, a logical and consistent progression.
(by the way this fact also confirms by logic that lvl 1-20 are class levels or "heroic" if you want and lvl 21-30 are epic character levels)
The perplexity arises from the fact that SSG developers categorize level 30 quests as legendary.
And just to mention it, do you consider that it is entirely possible that I'm correct, even though I'm "only" a player, and the developers might be making a mistake here? I have the slight impression that some players believe authority holds more weight than logic and evidence.