I agree that minor drips should not be a problem, and can almost always be avoided through changes to technique.
But I can also understand why people expect modern pots to be 'technically perfect' (or perhaps 'technically flawless').
It's easy to ask, why would I accept a slight dribble when I know that modern pots are capable of being absolutely drip-free?
In this case, one answer could be that this pot maker is offering seemingly good-quality, genuine, additive-free clay in sizes and styles suitable to how many of us like to brew our tea, and we can forgive a drip or two (or four), but ultimately different people will prioritise different concerns.
Similarly, I don't think that a very fast pour is necessary for me, but I can see why others take a different view (although I would disagree with the proposition implicit in many online tea shops and tea blogs that a slow pour is necessarily 'bad').
@teatray: I can also see why it can be annoying to be told that there are ways to manage an issue, without being told how, but I think that that's largely a result of the difficulties in talking about tea, teapots or tea-making methods across the internet. Those difficulties tend to disappear in-person, but for most of us outside Asia, learning about tea is a solitary experience.
Andrew