Apple isn't going to move the menu bar based on its screen size and the majority of Mac screens are 24" and smaller, and not ultra-wide.
Still, you can test yourself by trying to click both the safari new tab button and something in the menu bar like the Apple Menu or Battery icon, for example. Safari requires more precision by slowing down before reaching it and window buttons are still easy to overshoot unlike the menu button with its hard stop. Try clicking the new tab button in full screen without overshooting and exposing the menu bar. Now consider it from the point of view of someone with motor control issues.
Have you considered using something like Menu Anywhere to have easier access to the Menu bar on huge screens.
Access the menu from anywhere.
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