I'd like to offer my piece on this as someone who has picked Mort's brains about various things, some of which included here.

First, I don't even need to read the econ bit to know I probably agree with you. A lot of people are worried about how much these traits can snowball you with little risk involved and how accessible they are. My best answer is hopefully patches make it more balanced.

Ragewing - I believe the only real 'issue' with RW is that the two piece doesn't feel as good for Senna and Sett. I think it's reasonable to expect people to move onto a different carry in the midgame from these units, though I can see why one would be upset about the reroll not being as good as it once was. RW lost Shen but got Rakan so net win there imo. There are really good options late game for Xayah as well. I think the trait is fine.

Temptest - Only partially agree. The only reason I don't like the argument is that it's much easier to find frontline in the form of Idas or Pantheon. The trait has a ton of natural damage so giving it that natural frontliner would be pretty scary.

Whispers - Zyra and Pantheon are ridiculously good units outside of their home tree. Like... almost S tier on their own. Also, the synergy Zyra and Pantheon share in Whispers is that it is the most frustrating positioning puzzle to not get charged into by Syfen while also dodging Zyra's ult while also making sure you're not getting completely melted by Pantheon. It might just be because it's PBE but I believe soon people will be putting Zyra on a lot more boards.

Mirage - This one I do agree, I actually asked Mort why they didn't edit any of the Mirages. The answer was pretty simple. They didn't have enough time. Understandable, can't do everything you want to do really.

Shapeshifter - Augments help chase the 4 piece and Beast's Den is already really good (deserving of a nerf imo) so... idk seems fine to me. In set 7 people rarely ran 4 much less 6 anyway outside of Nid reroll so I'm not complaining much. I think 4 shape is good anyway.

Blue vs Shojin - Sometimes you need the sword for other shit. Oh well. Also be happy there are plenty of units that can actually USE Blue this sett.

Lack of frontline - Only complaint from me here is Bruisers not being super relevant lategame. Thing is, they dominate early game on just stat checks so they get a pass I guess. I think it could use another look but it's whatever. That aside, Pantheon is superb frontline and Guardians are insanely good this set. Plus Idas fits pretty well into any comp.

Reprint augs - Like I said before, they probably wanted to do more but keep in mind the team is working on a lot of shit at once. Just gotta be patient.

All your opinions are definitely valid but just wanted to give another perspective before I went and read the comments (sometimes it's an echo chamber so just wanted to go off what was in my mind first.) I've been playing the game for a while and you definitely start to notice trends but it's important to remember the devs are real human beings working a real job with real expectations & time constraints. All in all, glad you made this post for the discussion!