I think you're really nitpicking here. The offending sentence -- "The spell does not give the new form's other abilities (attack, magic, special movement, etc.), nor does it run the risk of the wizard changing personality and mentality" -- isn't ambiguous at all. I'm interpreting the usage of the "etc." to mean that the caster does not gain any of the new form's abilities other than appearance, method of movement and breathing. It even mentions that in the first two sentences: "When this spell is cast, the wizard is able to assume the form of any creature, save those that are noncorporeal..." and "Furthermore, the wizard gains its physical mode of locomotion and breathing..."
There are other differences between the two spells, most notably that polymorph self contains a small healing side effect (the wizard regains up to 1d12 hit points after the spell ends) and the caster has the ability to change forms during the spell's duration, each change taking one round to complete.
"Etc." includes the emulated creature's actual AC. I quote "The wizard retains his own hit points, attack rolls, and saving throws." and "The caster retains all mental abilities, including spell use, assuming the new form allows completion of the proper verbal and somatic components and the material components are available."
Regarding equipment, a lenient DM could allow for some magical items to continue operating even while polymorph self is functioning. (It says that in the spell description.)
Seems pretty clear to me what is gained and what isn't.