I guess it's mostly just not economical to produce such a thing. As other commenters noted, with good quality disposable safety blades you get between 3 and 10 shaves depending on your hair and preference. When you buy those in a typical bulk package containing 20 cartons of 5 blades each, your yearly expense in terms of blades sits around the €5 point.

Perhaps Gillette could put out one of their fancy twenty-odd blade monstrosities with an extra ceramic blade in front though. I'm sure that's marketable to people who haven't figured out they're spending way too much money on something that costs a fraction if you look beyond the products pharmacies push in your face.

Ceramic knives are so prone to chipping that they effectively have micro-serrated edges even when freshly sharpened. A micro-serrated edge on a razor pulls hairs and cuts skin.

I don't doubt that in your experience ceramic knives cut food better than metal ones, but I suspect you have not used a well-sharpened knife. Mass-produced knives are typically sharpened using belt grinders and do not cut as effectively as knives hand-sharpened by someone skilled at it.

https://scienceofsharp.com/2018/02/24/ceramic-blades/