I take a big knife because I want to , mainly , I guess its reason number 1 anyway .
I guess clearing a path thru cane grass is another reason , thats interesting stuff , and the plain old weeds , farmers friends and thistles blackberry and lawyervine ... and low hanging slap face or nettle tree leaves ... I like to be able to just slash em down and whack my way thru them rather than be untangling the spikes out of me and my gear .
well , thats why I like a larger knife anyway , between about 18-24 inches blade length

Okapi calls them a bush knife , others call them a machete ...
but a smaller blade , between 10 - 12 inches I like to have for a lot of reasons , begining with I like to have it for the emotional security aspect , a big knife makes me feel good
then there is the useful aspects , I like to indulge in a bit of hunting , and Im just used to butchering with larger knives
they make good drawknives cum planes for things as peeling bark of poles , or smoothing a handy log for a seat .
I found it easier to use a bigger knife to drop a bunch of coconuts by just chopping the stalk and letting them drop than it is by whittling thru the stalk , and yes I have tried both methods .
the actual amount of times I use the knives and the jobs I use them for realy depends a LOT on where I am at the time , camping in a paid site in a caravan park , I use a little knife to open packets ... camping free up in QLD on the coast , doing the bush tucker thing , I use it a lot , from holding the claws of a mudcrab down ( I am just not brave enough to do it with my bare feet as the locals do ) to getting the flower stalk off a grass tree for a fire stick or spear shaft , to poking around the same tree for resin ( great glue that stuff ) or if we are more outback like kicking around in the inland reigions of WA I use the bigger blade for things and cutting digging sticks to get grubs , or on the coast for teasing rock crabs out of their crevices to use them for bait its a sadistic thing to do to watch an octopus slice itself up in a sharp blade , but I have seen them do it , walking on a reef that is having a hard time ,t he critters was going to have a go at my foot , I put the blade between my foot and it intending to push it aside with the flat , it grabbed the blade , and again with its remaining tentacles ,I had octopus for lunch .
A bigger blade is useful for things as prying the larger shellfish off rocks as well , but it can be abusive to the blade too .
there is all kinds of things I use my bigger knife for , but if I was to adopt the standard western style of camping , and bring all I need with me , sleep in the bush a few nights and go home again ... yeah , there is very little need for a bigger knife ...
barely a need for a itty bitty pocket knife
I reckon that it comes down to your personal style of camping
