Alex Harrison I wouldn't say so. Shopping is something they want to do. But updating the browser (or OS or anything else for that matter)? Why? They can use Amazon, and updates are troublesome. They take forever, you can't shop while its updating and you can use Amazon even if you don't update. Updates are a waste of time, just click them away and be done with it.
There are still people using Win XP and Win 7. Just go ask them why they don't upgrade to Win10. Try to argue with security features and important updates. You will find that most of them have no interest in that stuff and just want to do their thing in a familiar environment. Especially, the upgrade would cost money. Why pay when stuff works?
So, if you still want to reach such people, you better stay backward-compatible. If you don't, others will and make the money you could have made.