My experience is the same as yours, except the opposite. I kept hearing how wonderful the Mac software world was, until I had to work on one for work. Everything was a lie and a lot of software was subpar to the Windows equivalent (Github app for instance, Finder is almost unusable, Eclipse is a memory hog and IntelliJ keeps crashing because it's not fully compatible with Apple's Java version). Just my experience.
"there was a lot of software that was vastly better than the equivalents on Windows."
The reverse is true as well.
"Examples include software by the OmniGroup and Panic"
Coda is so overrated IMO.
Even the feature screenshots on their website look like a lot of oldschool Mac software. There's nothing "best desktop software" about it. I'm genuinely curious what specifically you think it's good about it.
Is it how their window buttons are vertical "just because", spitting in the face of good UX?
Is it how they recommend you connect via FTP to a remote server as soon as you open the app to publish your files directly from your computer? Do you have any idea what a horrible practice that is?!
Oh and let's just put the browser in our app, I'm sure that is a genius move, nothing wrong with that! /s
Oh yeah, and Panic's SSL certificate expired, not very professional if you ask me.
Right... well...
TLDR my point is I don't believe you when you say Mac has better software on average and your examples don't convince me. I work on a Mac too. But hey, we all have preferences.