I have a 2009 iMac 27 inch running every day in my office, but not for anything mission critical. Had to swap to Windows for that, at a certain point. I even have a 2005 MacBook Pro in the shed which can run the Nikon software for my Nikon Coolscan. But I never used it. It’s still there. I switched to VueScan. So I can handle legacy hardware and software. But I don’t like the idea of eventually painting myself into a corner. I much prefer recent OS, not too old computer, and current supported software. I liked Aperture, but just accepted I had to move on. I found it let me down one time, too long ago to specify what exactly. For a long time my 2011 X100 images were going straight to Apple’s Photo app, which is a little more sophisticated in the last ten years. My grown up camera digital files have been imported to Lightroom from M9-P purchase 2012. I like Lightroom, which is is a little more sophisticated in the last five years, and I need access to Photoshop much less lately because of that. Layers. A mental hurdle, forced on me for one project. It’s easy, and powerful.