Preview is one of the most underrated pieces of software in the world today.

I make the assumption that Quicklook uses Preview (because surely it must).

Being able to hit spacebar on just about any kind of selected document/image type file and see a near instant look, multiple pages and all, is so important. Once you don't have that (move to the Windows world), you realize how much you miss it. And you can, with a small bit of effort, add capabilities for additional files such as Markdown.

Being able to open a PDF or image in a fast, reliable native viewer, and even do some level of editing (such as quickly adding a signature!) is super useful.

In terms of reliability, every time over the last 20 years (some distant, some recent) where I tried to live with a Linux desktop, things would stop working after a short while. Meanwhile, I have lived on my 2014 MBP since 2014, going through multiple OS upgrades in place - no wipes/reinstalls - and find it just as performant as ever. It is in most use cases more performant than my 2017 _much_ higher spec Dell XPS 15 (in Windows or Linux boot mode).

There are still some things I hate, #1 being that when I cmd-tab to a window which is minimized, it doesn't raise that window. What is the f*cking point of cmd-tabbing to an application if you don't make its window visible!? This I have never understood. But generally speaking, macOS on Apple hardware is unmatched by any alternative.