I seem to remember (correct me if I'm wrong) Phil was living in Switzerland and had a young family, maybe it all got too difficult logistically speaking.
His shoes will be hard to fill, he brought the marketing of Pinball machines to a new level: professional advertising campaign, highly polished teaser videos, smart and tactful handling of Pinside, etc.
I hope they can find a suitable replacement.
Good luck in your future endeavours Phil!