I understand your point but the problem is that most of the user's who use a apple device got some problems with xenforo 2.
They have problems to see attachements, they have problem to charge pages ect...
Its not only a problem with safari on windows but a problem with safari on apple devices.
Result : since xenforo we have +12% bounce rate for apple devices.
apple devices users are telling us: pages are slow, attachement got problems, problem with the template of somes pages ect...