Yeah because hardly anyone uses Safari on Windows. They're primarily a hardware company so providing software to a competing system that has no hardware benefit for them and no one uses would be a dumb move.
Also, no one made you upgrade. My 4S is still on 7 and I still see people using 6. You jumped on the bandwagon early, shit broke and you got upset. Likewise you can't blame them when 3rd party software is coded in a way that easily breaks between versions. Most of my software worked on my iphone 6 just fine. There were just a couple games that were busted. When your app store model has people expect to get free upgrades for life just because they paid $5 once for the app then you get app developers that might not do a great job or won't be fussed to upgrade quickly. Yet if these developers wanted payments for major versions you, like many others, would probably complain.