I mean, Goku and Vegeta were significantly weakened when they used Potara fusion against Zamasu, and it definitely seemed to have an impact on the power of Vegetto -- hence him eating the last senzu bean and powering up immediately after:
https://i.imgur.com/aNF40cs.png
https://i.imgur.com/WpszeWT.png
https://i.imgur.com/dTTdXVY.png
https://i.imgur.com/zbDxAg2.png
https://i.imgur.com/9X0gq2F.png
That's why I'm asking about Gogeta's power. I mean, it doesn't seem like he'd be operating at full power, given how weakened Goku and Vegeta were when they fused, but the implications of Gogeta being neutered...and still doing what he did, as effortlessly as he did it...are just asinine. /shrug