The reasons I travel with carry on baggage only are: -
a) have had baggage go missing
b) have had baggage damaged
c) have had baggage opened and items removed
d) Have no desire to hang around a carousel for a long wait
e) is easier to get around
f) don't get hassled by porters at Jo'burg
I do not carry one of those extra large bags that some other people do. I always attempt to ensure I have the correct sized bag, or something smaller. My most used item is a snugpak 25 litre rucsac with no side pockets.