The day Apple allows other browsers is the day you can put a countdown clock on the entire web only working with Chromium in a way that Microsoft could only dream of during their IE on the desktop period. Not because Chrome is better, but because Google has been very effective at using its dominant web position to force people to "upgrade" to Chrome.

Even Microsoft, which invested huge amounts of money in Edge, packed it in when Google kept telling people that Edge was going to kill their firstborn (or whatever other tactics they use, like allegedly making YouTube not work properly.)

So, yeah, I'm fine with allowing other browsers - a few years after we've seen Google successfully broken up.

Meanwhile, I'm fine with websites just not using Optional Chaining operators. It's syntactical sugar. And frankly, rapid iterations on JavaScript, adding optional features only supported on Chrome and then making people think the web is broken without them, is a huge source of Google's ability to bully people into using Chrome.