I've checked several of the programs you've provided, and here's a report:
- Readarr: has docker image(s) in Docker Hub
- PhotoPrism: has docker image(s) in Docker Hub
- Prowlarr: has docker image(s) in Docker Hub
- Openbooks: has docker image(s) in Docker Hub
- Jackett: has native linux binary in the official Github releases
- FlareSolverr: has native linux binary in the official Github releases
- Transmission: it's commonly provided in the Linux distro repositories
Those who refuse to do such a minimal search and/or better look the Github releases page, they definitely deserve to stay on Windows, rather than spreading misinformation.
If a program doesn't to have a package for a given platform (no doubt about those cases), it's a developer's resources problem (and essentially, an O/S popularity one). It'd be ridiculous to say that having to manually install a certain program on Mac is inherent in Mac itself.
For the record, at least in my case, it's certainly not the "vast majority" of applications. The following applications don't have easy to install packages. Even when there is, as in the case of Calibre-Web, Transmission, and NZBGet, they often require CLI configuration and/or intervention.
* Readarr
* Openbooks
* PhotoPrism
* Prowlarr
* Jackett
* FlareSolverr
And these are just the applications I could spot in five minutes.