The outfits *were* pretty awesome, as evidenced by the photos from the concert merch membersets in the photo below:
And in case anyone wanted to see the huge list of concert merch: --> https://www.elineupm...98cc0cfeca1eb9/
As for why they didn't pick this set of outfits... I have no idea. It's a tossup as to when and if the promotional outfits are concert ready. Maybe it depends on walkability or the concern that accessories could get caught on something.
Examples when they were ready:
the member color outfits for 2012 fall and Reina's graduation.
the pink-camo ones were used in Sayu's graduation.
the white outfits were trotted out in the encore for 2015 spring.
the "fashion outfits" were brought out midway through Suzuki Kanon's graduation run.
the Vision outfits were used everywhere in the end of 2016 (I think this board talked about it).
Examples when they weren't:
the Prism tour (Riho's graduation) was a mess all over the place as the promo outfits were only used for the calendar and they borrowed Imasugu outfits for the actual advertising (like billboards and flyers).
Inspiration's flower-girl promo outfits were never used.
Regarding graduation fatigue: Don't forget this year there were the earlier planned graduations of C-ute and Momoko, and they symbolised the end of an era. Duu's graduation by contrast doesn't really change the member dynamics too much. And then, there were all of the unexpected announcements: CG's effective hiatus, Ruru and Kawamoo's promotions, Ichioka Reina's new group, Kobushigeddon... this has definitely been a busy year for H!P on top of the lengthier CD single promotions and Tsubaki's debut. It's almost no wonder they didn't have time to make the 20th Anniversary even more of a splash.
If Duu had just waited another 6 months for things to calm down or SOMEONE could have made a convention appearance, there might have been more buzz here Stateside. But maybe that extra six months was really crucial for Duu's career, I don't know. Regardless, it's what it is.
On the other hand, goods-side it's been non-stop. For all those efforts of Mizuki and Teddy and Maria putting out photobooks, the level of Wanibooks' support for Duu was easily the best I've ever seen (and that includes all those camera books that Sayu did). This concert had 9 DVD magazines, 2 of were just devoted to the Haru-sempai serialization, plus 4?5? volumes of the Wanibooks magazine. Call Riho an ace but I doubt she had even that level of photoshoot power (maybe this is a good thing).
As for the concert itself:
Um... they really overdid themselves on the setlist changes. I counted 10 setlist variations, so that's saying 40 songs were rotated throughout. (At least they didn't try to bring in costume changes.)
It was... OK, I guess? Endless Sky was a definite tear-jerker but everything else was fairly standard. The camera didn't catch any shenanigans so I can't say much, but that wHaruna/Kaede MC was pretty good. (It was about their complete lack of compatibility with each other). The setlist was a combination of standard group songs rather than member-split ups, and while I totally agree with the choice of encore songs (Wakaindashi, Pyoko Pyoko, and Namidacchi), they weren't as classic crowdpleasers like Koko ni Iruzee or Happy Daisakusen. And, I wish they could have used the runway more.
In short: no one should be allowed to graduate during Special Anniversary Years. (I'm looking at you, MM'22.)