This is quite possibly the most game altering change Blizzard has implemented in WoW thus far: Building a Basic Campfire no longer needs Simple Wood, only Flint and Tinder or a Gnomish Army Knife. This is right up there with stackable clams! Personally, my mind is blown.
Okay, let's be serious, this is actually a fairly decent (and convenient) change. Is it absolutely needed? No, not at all, but how many of us carried around Simple Wood and Flint and Tinder at all times? Who took those things to raids with them? Very few people, if anybody at all. And I can recall tons of times that people have rushed to a raid just after getting home from work and had forgotten to cook up their consumables. These fires would've been legitimately useful right then, but the small annoyance of carrying stacks of Wood around made it pretty unlikely that anybody had them. Nowadays, I think just about everyone carries a Gnomish Army Knife (and they should if they don't), so this is actually very convenient! You don't need to carry anything extra at all.