From Day 1, I installed extras-devel apps without any hesitation whatsoever.
Come on. What's the worse it can do? I'll reflash if it caused mine to not boot up properly.

I reckon I've installed about 100-200 extras-devel apps over the past few months.
Never had a single issue with any of them causing any global issues.
App itself might have been dodgy but if so, just uninstall it. No harm done.

Yes, people need to watch their rootfs space.
But Maemo5 OS should have some automatic monitoring/warning. No idea why it doesn't.

I want 0day apps. I want it now. Not after days/weeks/months. So I thank for extras-devel repo. =)