I couldn't think of a more branding-heavy native app. It's got the ribbon interface of Windows ported to MacOS, the rowed toolbox with different button sizes, the status-bar on the bottom, it's still basically a Windows app with MacOS widgets.

And generally speaking, yeah, people are happy to use Microsoft Office. The Mac version is nearly identical to the other versions. The "branding" is ignored or even applauded, because it enhances the overall consistency of the app. You might even be able to argue that Office on Mac only feels native because it goes out of it's way to not look Mac-native.

Regardless though, for non-Microsoft-sized companies it's not really realistic to ship, test and maintain multiple versions of the same app. It's much easier to pick one cross-platform framework and commit to it whole-heartedly, which is why we really only see native apps for single-platform or Microsoft-scale apps.