#1
Lets use the simple C major chord
Instead of playing
|---0-|
|---1-|
|---0-|
|---2-|
|---3-|
|-----|


why cant i play

|-----|
|-----|
|---0-|
|---2-|
|---3-|
|-----|


i mean c major is a triad not a 5 note chord... go figure
#3
well, the 1 on the b string is just another C, and the open high E string is another E, both of which are in your stripped down chord. it just makes it sound bigger, and a bit more colorful.
#4
You can play both. All you need to form a major chord is the root, 3rd, and 5th. The 2nd chord still has all 3 of those.
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#5
different voicing, different sound, a triad doesent mean your only playing 3 strings, it means there are only 3 different notes, with C they are C E and G, your just playing those notes more then once on 5 strings
#7
well i like the stripped down version BUt that means i have to write down the stripped down version for every chord, but then again this would help me memorize the fretboard much better