Why aren't oil drain valves more commonly used?

This vehicle in your example photo is a really good example for when not to use an oil drain valve.

Notice the heavy lugs on the all terrain tires? I am not sure if this vehicle is 4 wheel drive, but the tires indicate it the owner plans on driving on other than smooth paved highways.

A drain valve on an off road vehicle, is an invitation for a long walk home...

Picture this you are miles from the nearest paved road, no cell service and a rock, branch or other item comes in contact with that drain valve...

If you are really lucky it will only break the valve and all your oil will run out on the ground. Best case, you planned for this, you have the oil plug and 5 quarts of oil with you, plus a buddy with a winch to pull you out (hopefully you don't try and drive out, without oil).

But because you have a strong valve connected to a sheetmetal oil pan, it will tear out; either stripping the threads or tearing the oil pan. In either case even if you have the old oil plug and lots of oil, you are still not driving home until you install a new oil pan.

If you have a highway car, there is not enough ground clearance to get the oil catch container under the car, so you have to put it up on ramps or jack stands anyhow to change the oil. This also put the drain valve closer to the ground, and at risk from speed bumps, potholes and such. You will probably be close enough to cell phone tower to call a tow truck. Unless of course you don't notice and drive the car without oil until it stops running.

I have had one in my Toyota Camry wagon for 25 years. No problems. Very convenient. My was made by Frahm, or at least had their name on it. Not an off road vehicle obviously, but I do drive it on some rough or unmaintained roads.

I know this is late as an answer, but the real reason the manufacturers do not fit them is COST.

When they make tens or hundreds of thousands of cars they look to save every penny, nickel, dime they can - costs are kept to a minimum.

If cost was no object there are many things that could be included - automatic jacks to help changing a wheel, Remote control drain valves for engine, gearbox and axles.... the list is long.

So, if they include it the price goes up... And what do most customers do when buying a car - they shop around and haggle for the cheapest price.

I have the valves on all my vehicles, c12 cat in motorhome, chev avalanche, two ram pickups. All are protected and work great. The unit in the motorhome allows me to drain a gal at a time which makes for a clean job.