Here are a few issues;
1. Low take rate, so another design for a handful of typically not the target audience buyers.
2. An Automatic is FAR easier to use off-road then a stick
3. A stick shift transmission is far less reliable due to burned out clutches and the like. Also easier to check fluids, cool, ect on an Auto.
4. A stick shift transmission reduces reliability of the vehicle as a whole, and dramatically increases breakage as its a much more violent engagement.
Though I was disappointed, I was not surprised that there was no manual option, and I am fairly sure the investment to produce a manual would not have been a wise decision for Ineos, given the low-take rate. But I thought I'd respond to the points you made above.
1. Absolutely right
2. Agreed. Even when you are good with a manual off-road (the only thing I have ever owned), an auto is easier.
3. This is not as open/shut as you suggest. A good driver can avoid burning a clutch. You just have to get off the clutch quickly, even when something in your brain is telling you to keep it partially engaged. I have always found maintenance with a manual transmission to be very simple.
4. Again, this partially depends on the driver, and there are ways in which the manual is
more reliable. For example:
(a) A manual will let you know hundreds, if not thousands of miles in advance that something is wearing out. Autos can simply stop functioning out of the blue (less common with new ones, but still possible). Manuals do not simply stop functioning out of the blue. I would rather own a transmission that might need occasional service, but that gives you plenty of feedback as to its health, than a transmission that seems to be fine, until it refuses to function. I think modern autos (like the ZF 8-speed) are much improved in this regard.
(b) An auto can overheat when towing, or under other hard driving, in ways that a manual will not. Overheating an auto can be a pretty big deal, potentially leaving the vehicle immobilized.
(c) If you lose your starter motor or have a low-juice battery you can push-start a manual - which is also super-fun, and particularly exciting on steep rocky trails, or in the city, on a hill, heading into traffic. Its possible I have experience with both scenarios
A few more points:
(1) A manual has traditionally been much safer on snowy / icy roads, being able to hold a gear or downshift at your discretion. Of course, the manual mode found in modern autos has taken away this advantage with a manual.
(2) A manual makes you pay closer attention to your driving, which - one might argue - is safer.
(3) A manual is more engaging, and provides one with a greater sense of connection with the vehicle. For manual-enthusiasts - this makes driving more interesting and more fun.
(4) A manual is pretty miserable if one regularly drive in stop-and-go traffic; it is also a bit more tiring on really long road-trips.