Quick question on Intel Mac - I currently use my iPad for most things, leaving my 2018 MBP for mostly paying bills and banking. I don't really want to upgrade, but can get 300+ from Apple toward another Mac. Is upgrading inevitable at this point? Any thoughts on how long this 5 year old computer will be useful and safe? Downside? Not a techie here, just enjoy Apple products and want to avoid getting hacked. Any advice appreciated.