How usable is Haiku OS in practice?
It’s effectively a different kernel and window system for GNU at this point. Tons of GNU ports. Most targets cannot run original Be software for the obvious reason.
I was trying to set up an install for my HS age some to learn programming this summer with minimal distractions. I was surprised to see IntelliJ runs and they’ve integrated GNU core utils. A hello world program ran fine.
Lack of applications is my main problem
It's a delight to use, if a little esoteric at first. After the experiment phase, the software ecosystem comes up fairly limited. But I recommend visiting.
Here are some more impressions: https://kconner.com/2025/03/09/haiku-os-study-path.html