Remember the "Safari is the new IE" narrative? Just because Safari doesn't support some API doesn't make it IE, IE wasn't an inferior browser at the beginning either. What made IE the IE everyone hates was its departure from standards(?) and enforcing its own vision of the web thanks to its enormous market share. On IE's case, MS probably stagnated it to prevent competition against its desktop Apps business and on Go…
Safari caused me by far the most issues, back when I was doing frontend in ~2017/2018, in terms of how it complied with web standards (I wasn't as fussed at the standards it didn't support - at least I knew!) and rendered the web application I was working on across desktop, iPad and iPhone. I spent more time chasing Safari bugs and rendering idiosyncrasies than I did dealing with IE11, frankly.
Did I say "all browsers"? Sorry, not quite. iOS Safari outright refuses connecting. And it won't say why. I had to connect the damn iPhone with a cable to an Xcode machine, to open up browser console and see the error there. Turns out Safari is a special snowflake that requires doing some preparation ahead of time (no less than 3 steps!) 1) getting the Root CA into the phone, 2) install it in the cert storage, by the way you won't be able to do it if used a non-Apple app for step 1; and 3) enable full trust in the new CA. All that for a phone that I quickly borrowed from my flatmate. Thanks but no thanks! Not all developments are enterprise projects with proper laboratory devices.