Originally posted by RioRico You omitted the smiley.
Are quicker, one-handed photos better than more-considered shots?
Not necessarily, it depends on the subject, but that is an option available with AF and a pretty useful option at that. And one can shoot wonderful images one-handed especially with image stabilization being the norm.
Originally posted by RioRico Does the AF system always focus on the spot the togger wants?
That's why all modern cameras allow the user to choose an AF point...
Originally posted by RioRico How did generations of MF shooters manage to capture decisive moments? HINT: f/8 and be there.
Guesstimating focus and relying on dof by stopping down or setting the hyperfocal distance to get a reasonably sharp image is certainly a way of shooting but there will be situations this might not work well. And what if the photographer wanted to shoot at large apertures with narrower dof?
Originally posted by RioRico There's also the matter of possession, ie, the OP already possesses the lens. That's a big plus!
Of course any lens is better than no lens but let's get real, a modern AF lens allows full functionality (use of every exposure mode), quicker handling and faster operation that will be able to exploit the full capability of the camera. As an extreme example, you'll likely get more keepers by using an AF lens shooting a high fps sequential shots of a moving subject in variable lighting condition (moving focus, variable exposure) than with a MF lens.