Apple love to preach "the UI gets out of the way of your content" with each new redesign, but how true is that in practice? Let's compare the total height of the Safari UI with a toolbar, favourites bar and tab bar visible, across the three latest Mac OS design languages – Yosemite, Big Sur and now Tahoe. I've added a red line for emphasis.
It sure looks to me like the UI is eating more into my content with each redesign.
Oh, it's a cool theme, to be sure. But they overshot and need a lot of feedback to correct the mistakes. Let them know the places where this doesn't work so they can improve it. The same was true several years ago when they last overhauled the UI (a lot of errors got fixed that summer), only this is far more ambitious and they need as much feedback as they can get.
Beta 1 definitely doesn’t represent the final UI product. If you compare it to the WWDC Liquid Glass video, they’ve got tweaking to do. However with that said, LG is so much better in person and in use than pictures and video portray.