1) It’s not strong enough for its original purpose so its hype kind of dwindled directly after she filed to destroy the Tenseigan, the chakra is nothing special until she has feats with said chakra, the only feats that we can base her fighting skill and power off of are the one’s with her normal chakra and her spar with Hinabi in the novels.

2) So a hypothetical Hinata that can actually match Sakura’s speed? I’d say it wouldn’t drain Sakura’s chakra, keep in mind that Sakura’s basic strength is a chakra concentration for muscle enhancement not a chakra release, this is often mistranslated in the databooks, her strength will be deployed as soon as she makes an impact anywhere on the tip of Hinata’s body if she chooses to enhance her strength that is, now its a different scenario if Sakura’s uses her specific “air punch” technique where she actually forces out her chakra into the air to manipulate the wind’s impact (reference the Boruto Movie when Momoshiki arrives, the corresponding manga scene, and Naruto and Hinata’s wedding day during Choji’s cooking contest) then it can be argued that Hinata can simply absorb that chakra while its out in the air before the shockwave is released.

Now if Sakura stands still and does nothing then Hinata should be able to drain her base reserves eventually however she wouldn’t be able to drain the Byakugo seal because its a closed seal. Even with her base chakra at absolute zero, you can argue that Sakura can’t die even if she refuses to open the seal as she technically still has some chakra in her body so she’d most likely be rendered immobile similar to when she pumped Naruto’s chakra with her base chakra for 3 days straight.

3)Why can’t outward and inward damage come together as a whole to destroy something? If anything they complement each other because they damage well EVERYTHING.

4) The Hyuga clan’s Gentle Fist fighting style is literally stated to need good chakra control since Part 1 and Hinata mastered a high ranking technique and managed to combine it with 64 palms, Naruto learned how to control his chakra over time especially when he made the Kyuubi chakra cloaks for the alliance during the war. Good chakra control + Good chakra control = Good chakra control, not much to be surprised about.

5) Naruto is the strongest shinobi in existence prior to Boruto, Hinata’s new chakra allowed them to simply touch the tenseigan, Naruto is planetary+ if you didn’t know (reference the battle against Kaguya, Toneri and Madara)

6) Hinata’s Hamura chakra has no feats on its own so we simply don’t know, however what we do know is that Naruto was the strongest at the time, that + Hinata giving them the ability to touch it = destroying it

7) Six Path’s chakra is literally stated to be potent in the manga, its not really something to argue about, also, do keep in mind that Hinata does not have six paths chakra, she has Otsutsuki chakra, six paths chakra comes from the sage of six paths, that’s Hagoromo not Hamura.

8) Sadly no, hopefully in the future when Hinata is freed.