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.

After booting into Tahoe for the first time and spending a bit of time opening up apps, I had a feeling that my 16" MacBook Pro just got smaller, because things are bigger and less of my stuff can fit on the screen. What good is a larger screen if the UI keeps eating up all that space?

On the Mac we have the mouse pointer. It's a precision pointing device. Things don't need to be sized to work with touch. We can deal with higher UI and information density – we got by for decades.

@tuomas_h
Not the same issue, but my monitor keeps getting smaller, too, and I'm not thrilled with it.
In my case, it's because I keep having to change the scaling for my worsening vision.