Comment by notatoad

from what i can tell, the one-shot thing only works on youtube.

you might produce something that looks usable at first, but the actual application functionality will be significantly broken in most ways. it maybe works enough to do a demo for your video, but it won't work enough to actually distribute to end-users. and of course, as you say, it's not testable or maintainable in any way, so fixing what's broken is a bigger project than just writing it properly in the first place.