pm my belief is that Uzuhiko acts more like a connective tether for the "planet chakra" to move through an opponent rather than Boruto absorbing the chakra for an attack.
Narratively Uzuhiko is like a direct f-you to the Otsutsuki and their method of destroying planets for power. which makes sense because Boruto himself rejects the Otsutsuki whereas his narrative counterparts rn, Kawaki and Code, both embrace it for different reasons. Kawaki uses Karma to kill Otsutsuki (pm using evil to kill an evil) , while Code deifies the Otsutsuki and strives to reach the highest point of their evolution.
Where the Otsutsuki absorb a planet's chakra and destroy them, Boruto, who has embraced the Shinobi ideology instead, has created a jutsu that allows his planet to fight back against its oppressors by directing its centrifugal and rotational energy towards them.
a couple of things support that, rather than absorption
- The Vertigo effect lasts indefinitely (or at least until the planet naturally dies), which would mean the energy being used for the vertigo effect isnt affecting the rotation of the planet enough to cause a premature loss in rotational speed that kills everyone on the planet.
- Uzuhiko has been previously described as a contract that Boruto can rescind.
- When Uzuhiko is being used the planet has been described as shaking rather than slowing down, which means the jutsu is affecting the planet rather than taking from it.
- Despite Boruto attracting the chakra to him, it's not amplifying his stats.
- When Boruto describes Maximum Output Uzuhiko, he says if he doesn't hold back, he might be able to one-shot Hidari with the energy gathered. this kinda implies that Boruto is the one limiting the energy coming out of Uzuhiko rather than it being a charge via absorption like we all thought it was initially from the fan translations.
- Uzuhiko mechanically is pretty reminiscent of Kirin, attracting a large amount of energy and directing it at a target, which would be in line with Sasuke saying he taught Boruto everything in his arsenal.
there were a couple of other things too but i don't fully recall them rn