Well, I don't think that you got my point. Sure, The karma makes Boruto OP but it's not like he can tap into it's power any moment. What we saw is the end result of mastering Karama as Jigen showed us that it. Meaning after completely mastering Karma will he become that strong.
"What was I expecting? A more grounded story of Shinobi and how they move into the future. Kawaki said that he'd end Shinobi. Why? That could be intriguing, like why does he feel the system is flawed?"
Well that's still left to be covered. We aren't even at that point yet.
"Absorbing OP jutsus doesn't mean things are even, the opponent can still have greater speed/power. But even absorbing jutsu isn't that original, since it's been a thing since the Preta Path."
Yes, but we haven't seen any protagonist with that exact power as their main thing. All the people you metioned have raw destructive power. Imagine kind of a luffy vs eneru fight when it comes to Boruto, that's what I'm expecting.
" certainly didn't expect the Karma mark to make Boruto stronger than Boro of all people (who remember, is stronger than Delta and is in some ways worse than Jigen apparently).
I didn't expect them to think "Oh to make this series interesting, we have to hand the protagonist a ridiculous power-up that already shoves his power to levels that as of right now look like they at least rival Naruto and Sasuke"
Once again, that'll will be the case when Boruto MASTERS the karma. You're acting as if Boruto already can tap into all that power. Heck we don't even know if he could activate the Karma seal without Kawaki's resonance. You're really jumping the gun here.
"It's not necessary for anyone to catch up with them. A good story can still be written with the two still at the top. Heck, even with all the power-ups that they got, Naruto and Sasuke are barely on par with Hagoromo."
One of the main themes of Boruto AND an important theme in Naruto was the new generation surpassing the old. Kakashi said it multiple times, the five recent Kage, Naruto and even Sasuke have said multiple times that this should happen. If it doesn't hapen, then the show will fail it's purpose.
"Can't speak for Squinty, but I was expecting a generic power boost, not the possession of a dead Otsutsuki that allows Boruto to completely obliterate the opposition."
As I said above this power-up will be obtained by him after mastering the Karma seal which probably will bring him a lot of suffering. We don't even know if could activate the Karma seal without Kawaki's resonance let alone tap into even 1% of the power Momoshiki displayed.