I come from the ice age. I have started what it is called today “web development” during the first release of PHP 3.0 and ASP 3.0. That happened in the previous millennium. In the previous century!
Back then IE had more than 95% of the market.
Until ~2010 it was a complete nightmare to develop front ends. You had to develop special cases for IE. Paddings? Margins? Overflows ? Give 10px to IE and he will eat 2 of them. I can write for days about those nightmares but the memory of clients using IE 6 (worst: IE5.5) in 2010 still gives me creeps.
When Chrome came into the picture, it was the best thing it could happen. It was the heaven on earth like jQuery was (and is) for a JS frontend dev. I was among first people who said: Use IE to download Chrome or Firefox!
So if you ask me, a unified browser would be the perfect future. I would ask Google, Microsoft, Firefox and Apple to agree on the f*****g specs and release the first unified version of “Gomfa Browser” (or whatever acronym suits their ego)…