It can be quite fascinating to explore the list of suggested (related) videos on YouTube.
Anyways, here was this suggested video about a Q&A with Linus Torvalds as to why Linux was not competitive on the desktop came up:
https://www.youtube.com/watch?v=KFKxlYNfT_o (3:23 min:sec).
While this was in 2012, very little has fundamentally changed since then. The success of Linux in the smartphone/tablet space is as the kernel underlying Android. There was a potential success of Linux in the desktop space as the kernel underlying ChromeOS.
Linus attributes the failure of Linux to become dominant on the desktop to the very limited number of systems offered on the marketplace with Linux pre-installed and to the fact that most users do not wish to install an operating system on their devices.
What Linus fails to mention is that, for a system manufacturer as well as for an user, one big question about installing Linux is “Which distribution to use?” There are nearly 300 different distributions tracked by DistroWatch and fanatics of one are often pretty nasty in their comments about the other ones…
I have seen a few web-based re-sellers packaging brand name desktops and laptops with a Linux distribution. Maybe one of them could become interested in doing the same for Haiku once it reaches R1?