That's a load of crap. I use safari for all my browsing with the one exception of using Firefox for read.amazon.com. It's perfectly fine. I'm never working on my computer an thinking, "damnit safari, why can't you just be like chrome/firefox." That never happens. I vastly prefer safari to chrome or Firefox.
At work I'll use chrome because some of our web apps only support chrome for whatever reason. But they're garbage IBM puts out, not something you'd use by choice.
Developers make sure their sites work in Safari. Just like developers made sure that their sites still worked in IE11 for almost a decade. Because it works for you is exactly why it's holding back development.
If developers made sure their sites worked in Safari we wouldn't have submissions to HN for sites that only work in Chrome with "oh yeah it doesn't work in Firefox or Safari because I didn't test it".
The number of developers who do their work on Chrome and call it a job done and never test in another browser, far outweight the number of developers who do test cross-browser.
The reason people tested in IE11 and less was because they were forced to. They liked Chrome but the users were using the shitty browsers, and older OS didn't yet support Edge.
Now the majority use Chrome and the devs no longer care.
We need more competition in the browser space, Safari and Firefox provide that. And neither are holding web development back.
Apple actively cripples Safari so that developers are forced to make apps for the App Store and give them a cut of all revenues. Safari is an extremely cynical product, much more than Chrome. Developers should not support Safari. Let the sites break.
What does Twitter do that requires an app that doesn’t work on safari? What did Reddit do that requires an app that safari can’t do? LinkedIn? Steam? EBay. Amazon. Google maps. Discord. Slack. What do these do that can’t be done on safari on iOS?
At work I'll use chrome because some of our web apps only support chrome for whatever reason. But they're garbage IBM puts out, not something you'd use by choice.