TLDR - older devices. Need to upgrade computer, iPad and iPhone. That's an expensive adventure all in one year.
Mid-2013 MacBook Air, 2014 Mac mini, and iPad Air 2. All older devices with the latest MacOS and iOS updates. The MacBook Air and iPad Air 2 are devices purchased for the kids, and have now come back to me as they have moved on to newer ones. Support is clearly over for all.
The Air battery can't hold a charge for more than a few hours when off charger and in active use. The iPad Air 2 is functional, but slow. I don't use the Mac mini that much anymore given that I can do most things that require a full desktop browser or non-iOS app on the Air. TurboTax is the main app that I've been using on the Mini. While I understand that TurboTax is available for iOS and iPad OS, during tax season, I'm having a hard time imagining working on taxes on a single and relatively smaller screen.
Currently have 2 x 34" wide screen monitors for work/home use. I just swap out the HDMI cable as needed between work laptop and the Mini, but that is a relatively rare event now given I can do most things non-work on the Air or iPad/iPhone. In addition to the older devices listed, at some point this year I'll probably need to update from the iPhone 8+. Battery Health is 90%, which is still good given I purchased the phone in September, 2017. AppleCare is also over for that one.
Ideally I'd like to update the Air, iPad and iPhone this year; but that's an expensive endeavor and not sure something we want to do. As someone who works in IT, I need to run virtual machines, and at this time I'm not aware that iPad OS can do that, so that probably narrows down the priority somewhat to an Air or Mac mini. I am wondering what new iPad OS capabilities and features will be revealed at WWDC. I am also impressed by what the iPad has become now that it runs iPad OS and would like to use the Apple Pencil along with the other iPad OS features.