Shouldn't Sasuke have learned sage mode to enhance his power level and address his chakra issues?

Learning sage mode has proven to increase the power level of various characters in the Naruto series, such as Madara, Hashirama, Minato, Naruto, Jiraiya, and Kabuto. Given this pattern, it's reasonable to assume that Sasuke would benefit from sage mode as well.

Sage mode would not only augment Sasuke's power but also address his chakra issues. By utilizing sage mode, Sasuke's chakra levels would be enhanced, and he would have a means to replenish chakra during battles. Opening portals with his rinnegan currently depletes Sasuke's chakra significantly, exhausting him before engaging in combat. With sage mode, the chakra expenditure for portal usage would be reduced, alleviating his chakra problems.

Moreover, sage mode would provide Sasuke with the ability to replenish chakra during prolonged battles. Naruto has effectively utilized sage mode in this manner, entering and exiting the state during his fight against Pain, while also gathering nature energy through Kurama during his final battle with Sasuke.

In summary, learning sage mode would have elevated Sasuke's power level and potentially resolved his chakra issues, or at least mitigated them.