My god that video just had me rolling. The dog licking the carboy was priceless. Funny stuff.
Do what ya want and love what ya do. Everything else is just opinion.
Regarding headspace, I don't think it's a terrible thing to fill it near to the top. It does mean you'll lose a little bit (or a lot) to blow-off, but as long as you're prepared to handle that, it only means a bit of an efficiency loss.