The philosophy of accepting only open-source software on Linux is holding back that platform on the desktop. I hope that Haiku will attract a mix of open-source and proprietary software so as to get out of the sub-1% market-share ghetto that Linux has been in for over a decade on the desktop. Haiku being a desktop OS means that it has a different set of priorities than a server OS like Linux. Even if you consider Linux to be a desktop OS, certainly you must admit that the philosophy of Haiku is and should be different from Linux.
In the areas where proprietary software does exist on Linux, like video card drivers, the functionality tends to be better than the open source equivalent. So there is room for both even on that platform.
I’d love to see closed-source software, big and small, available in the Windows and/or Mac world on Haiku such as Microsoft Office, Adobe Photoshop, TextMate, Sublime Text, Pixelmator, and many others ported to Haiku. Although I admit that is not a likely possibility.
Furthermore I’d love to see open-source software such as Firefox, Chrome, Thunderbird, Calligra Suit, Libre Office, The GIMP, Audacity, VLC, and many more properly ported to Haiku as well.
Proprietary vendor-supported drivers would also be nice to have for hardware we don’t currently support or support poorly. Wifi drivers come to mind off-hand. A better selection of fonts, including proprietary fonts would also be nice to have. Although I understand that is not possible in a free (as in beer) OS.
I am not opposed to paying for good software, whether proprietary or open source, and I would hate for Haiku to be identified with the notion that paying for software is taboo.
That being said, Haiku is a re-implementation of a closed-source proprietary OS that went away when the company that produced it died forcing it’s developers and users to start over from scratch. So, Haiku itself should remain open source and not rely on proprietary software in the base install as much as possible so that it does not meet the same fate.
Perhaps a pay-for version of the OS could be created someday that included proprietary extras like fonts and drivers. Although that might be a bit too far on the proprietary side for some people. We would need to have that kind software available before we could consider how to distribute it anyway.