It has become quite clear to me that all this is going right over *your* head. Your idea that gears are approximately equal ratios is wrong. The gear ratios are selected at the design stage to suit the torque and power curves of the engine countered by the mass of the vehicle. Get this, the torque converter does not endow an auto with a magical low gear. It simply multiplies torque through a regenerative process. It does this at any time the engine is under power acceleration and in any and every gear.
Like I've said, that is but an attempt to make the trans foolproof. I have noted, however, fools are very ingenious and can wreck anything they turn their hands to.
Not at all. You would be surprised at the number of people out there who fail miserably to understand the concept of economical driving. You have indicated by your response above that you are one such person.
It ain't that simple.
If you drive in a manner that would cause you to require first whilst at a speed where you are rolling along in 4th, I'd suggest it might be time to hand in your driver's licence.