Well, we had to move away from Safari in our school because it simply no longer functions properly: Testing sites won't work with it, even if they say they should, audio cut-outs and bizarre network performance lag being the two worst issues. Open that same site, while Safari has paused necessary audio or refusing to load the next page, in Firefox or Chrome and *bang* it just works. Apple also hasn't provided the tools to education necessary to properly manage Safari through MDMs: Chrome and Firefox remain much more configurable across network installations. But that's pretty much just following the trend of Apple essentially forcing us to handle more and more of our education-based needs through non-Apple solutions. Even 6 years ago we never would have considered Chromebooks, but now it's something we review every year, since 75% of what our students do is already Google or Chrome based. Apple needs their "A" game back, but they no longer have even the slightest concept of what that "A" game should be.