No, not 'baby' users. I didn't purchase these machines, if I had, I would have bought a hell of a lot more than 512MB RAM on each (especially since it would have been 'lost' in the budget! 😉 )
But, if you're buying your first Mac with Tiger, you don't really know what the realistic required memory is until you've tried it. If you're buying your first Intel Mac, even more so, as it's impossible to gauge how much of an impact Rosetta (plus shared graphics memory, if applicable) will make on RAM requirements.
Personally, I think it's as much about Apple not shooting themselves in the foot! If they ship quite fast machines (as all the Intel Macs are), but they get poor customer or media reviews because of poor performance due to inadequate RAM, who gains?