I use safari regularly and it has not really kept up. All kinds of stuff that is partly broken for rendering. Especially on heavily dynamic sites. Chrome at least works for any web standard which IE did not.
Then came an upstart web browser from Google named Chrome....and now we're back to the bad old days of web developers coding to the dominant web browser again.
I have cursed too many websites to count because of their broken form designs (like assuming a particular postcode format) or reliance on cookies from ad vendors for basic functionality. If your website needs to generate “a new google recaptcha cookie” (whatever that means) before I can enter payment info, then sorry, no es bueno.