As a user, you are not the one that has to invest 100's of hours fixing platform bugs. If a website does break, you'd blame the website even if Safari was at fault.
It's also hard for any end-user to see the absence of functionality, or a useful application that never got built because it was too difficult or didn't have the underlying functionality required. It's hard to see an application that was only ever built for iOS because the costs of producing two native apps was too high, or the app that never got built at all. It's hard to see the increase in prices because of no competitive pressure on the native ecosystems, or a new mobile ecosystem that never got built because it didn't have access to apps users's wanted.
At the end of the day this all ends up harming the user.