This was great. Before Powder Game, there were several games in this genre, and a very active Falling Sand Game BBS forum. I got my start in programming by writing mods for one of those games, Burning Sand. I wonder if anyone from those forums is around here...
* Stack tracing needs architecture-specific support which is currently only implemented for x86-64 and ppc64. It's not too hard to add for other architectures, so if this is a feature you need, please open a GitHub issue and I'll get around to it soon.
* 32-bit ARM doesn't support /proc/kcore, so drgn can't do live kernel debugging on 32-bit ARM. This seems to be due to historical reasons rather than any technical limitations, so I may send a patch to enable /proc/kcore for future kernel releases. AArch64 doesn't have this issue.
Userspace application debugging with drgn also has a couple of limitations mentioned in the blog post, namely the lack of breakpoints and stack tracing for live processes. Again, feel free to open issues asking for these so I know to move them up my todo list.