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However, due to the player possessing two weapons in order to make it fair, Elder Scrolls Online only increases the off-hand weapon and spell damage by 6% instead of both of them.
Source: https://gamerant.com/elder-scrolls-online-best-dual-wield-weapon-skills/
That said, it's worth noting this was said in a podcast, somewhat off-hand, and not mentioned in an official report.
Source: https://comicbook.com/gaming/news/starfield-bethesda-release-date-report/