Welcome to the forum, Francesco.
My observation is that the pizza wheel problem certainly occurs, but episodically and infrequently. The number of printmakers I know personally or online who don't experience it seems to far outnumber those who do. I've made thousands of prints on a variety of Epson models (R800, 2400, 3800, 3880, and now the P800) over many years and would occasionally see an online reference to pizza wheels. Never having seen one I had to imagine what they looked like. Finally, last year, I experienced them myself using Piezography inks in my 3880. Interestingly, they occurred only with certain specific ink/paper/paper size combinations. I have yet to experience them with OEM inks.
Which, of course, is not to diminish the issue. Certainly pizza wheels do happen periodically to people. And I could not agree more on their unfortunate impact - when they do occur they completely ruin the print. But my empirical observation is that pizza wheels are an infrequent visitor in the printmaking world. For those who experience them on a more chronic basis, probably the best course is to work directly with the manufacturer (I don't believe they are a problem unique to Epson).
Back to the P800 video introduction, I thought it was a very well done intro, nicely complementing Mark's more in-depth written appraisal. And it was nice to see Dan, the Epson rep, confirm what many of us had long suspected - that the head design in the P800 was deliberately taken from the 3880 in order to retain that machines vaunted reliability (particularly for those who print infrequently).
Its somewhat fiddly front feed notwithstanding, I love mine and recommend it wholeheartedly.