Fridge, oven/stove, dishwasher, microwave/vent) -New sink, porcelain or something? 

And in this area the trend I'm seeing for rental properties is:-LVP flooring-if countertops do need replaced, do cheap laminate that looks like granite or quartz-if there are tile backsplashes or on walls in bathrooms or kitchens, reglaze with porcelain enamel -if wood floors, refinish them to look new-get rid of old looking light fixtures and replace with brushed nickel-repaint the whole house including cabinets-get rid old old looking vanity tops.

I used porcelain tile (pure porcelain all the way through, not just a glaze) so tough that we had to use diamond drills to drill in our anti-tip for the oven.

And does it work on porcelain metal tubs?

How to:1 - ...find Money2 - ...analyze Markets3 - ...use (not spend) Money4 - ...make a REI Plan...and stick to it5 - ...take emotions and flush them down the porcelain bus6 - ...control Risk by learning what Risk is, and how it applies to REI7 - ...learn the difference between cost to you and cost of the deal8 - ...separate yourself from the mindset of a homeowner and a REI9 - ...separate yourself from the analysis of Stocks/Bonds and RE10 - ...and, How to Do Algebra...in all its glory.

I just noticed that she chipped a big piece from the top front of the porcelain gas range, apparently with her large cast iron skillet.  

Worse case it could be cracked porcelain but even then it'll only cost $125 or so for a whole new toilet (plus labor, if you aren't doing it yourself).  

OK, I am convinced that porcelain is better than the cheaper red clay tile for rentals, but what about for your own residence, assuming you're going to be more careful with the floors than renters would be?

Ceramic or porcelain tile will last much longer, but I don't think it looks good except in kitchens, bathrooms, laundry rooms and entry areas.

Buy a porcelain for a $1/ sq ft.