Admittedly my "trash can" Mac sees little use these days. I thought I'd miss macOS a lot when I switched to Windows in 2022, but it turns out that I could live without it, though I do have a work-issued MacBook Pro, and so in a sense I never truly left the Mac ecosystem. It's kind of hard talking about being a user of one particular OS when I work with Windows, macOS, and Linux weekly and with FreeBSD occasionally.

Regarding the 2019 Mac Pro, I just took a cursory look on eBay for 2019 Mac Pro models, and it appears they are still going for over $1,000. macOS still supports the 2019 Mac Pro, though its days are numbered since Apple usually has a 6-7 year window for supporting Macs.

I believe there are two main reasons why the Mac Pro is still so expensive despite the fact that a M4 Mac Mini would outperform it:

1. RAM. Not only does the 2019 Mac Pro support DIMMs, but it also supports a gigantic amount of RAM: 768GB on models with 8-16 cores, and 1.5TB on models with 24 or 28 cores (https://support.apple.com/en-us/102742). No ARM Mac supports this much RAM. This makes the 2019 Mac Pro a nice machine for very RAM-intensive tasks that require Mac software.

2. The 2019 Mac Pro has expansion slots, though the 2023 Mac Pro also has expansion slots.