This is hinting at problems with promotion, if one adds devel for certain software he should still be very wary of updating-all with devel included. Update critical component with your psx emulator? Why not, what could go wrong... this is why the warnings used to be issued on per-post basis. I do know (I myself keep devel included all the time, though I review what is proposed for update) most people do this, but it is not problem with devel, we could move development outside of maemo, but it is even worse solution, it is problem with old and forgotten rule