I'm going to have to agree with
@AVonGauss I've seen Apple make changes in the past, some of which have stuck around that didn't solve something that anyone asked to have solved. Including the total washing out of the MacOS UI so that it's now much harder to make out shortcuts on the sidebar in finder. What use to be high contrast and colorful UI elements that were really easy to see have all become greyscale. It's much more difficult to visually see at-a-glance.
I've mostly learned to live with many of the dumb and ugly UI/UX choices that Apple has made over the years, but they do sometimes make changes for the sake of presenting something new and at times calling it a revolution.
The search/address bar shifting around with the open tab is hard to follow. It doesn't follow a natural or intuitive work flow. We scan left to right, top to bottom. Our brains and eyes work best when we move through a workflow from a fixed point of reference. When the address search bar moves ever more to the right with every newly opened tab, you look down to do work and look up and your eyes default to the right. Lo and behold you go to change the address or see what the address of your site is and where has your address bar gone? Not up in front of your eyes, off out to the right, but not just off to the right at the top, but one of the fifteen or so open on the right.
It's not a good choice. And it doesn't even have to be a point of contention or an argument from Safari users on any forum because this software on a full version desktop can be easily coded to allow for a preference menu option to allow tabs to be inline, below, above the address/search bar. The search/address bar can be dedicated and fixed in the customize toolbar menu. There is no rational reason that flexibility in customization can't exist for the user. But to take away an established workflow to bring in a new UI at the expense of user' preferences is unnecessary really.
I put in a ticket in the feedback assistant. I hope many, many other users will do the same thing. Once upon a time Apple made exclamations about how MacOS was the most customizable desktop user experience on the consumer/commercial OS space and they use to make products that were pretty revolutionary. What I think would be a triumph for Apple today would be to herald in an age of customization for users in the desktop OS. The one thing that should set apart a full version OS and a mobile OS like iOS is the ability to fully use that desktop real estate to do much, much more.