Sounds like you're reasonably happy with whatever macOS setup you have if you can wait 3 years. For people who are inclined to upgrade sooner, year(s) of waiting for Face ID on a MacBook is a lot of wait little gain IMO. Particularly because macOS can unlock a Mac with Apple Watch, if you're wearing the watch, and configured that feature. With that setup, you're logged-in pretty fast after waking the locked Mac. For me, that obviates Face ID's most frequently needed convenience. And for considerably rarer online purchases and authenticating to other clients, the new MBP line has Touch ID. That probably isn't a big hassle if you're not doing it every time you sit down. Also, if you have an Apple Watch, macOS lets you use the watch to authenticate Apple Pay transactions, but even that's too much trouble compared to one's thumb on the MBP for a moment when buying something. Beats pulling a credit card out of the wallet (such as when buying more Apple equipment ;-) )