I've used Esbit tablets (for solo hiking) exclusively for the last 5 years.
1) Yes, the packaging is bulky. You will experience some minimal damage (rounded edges, corner chips) depending upon how much freedom they have to move around. Even broken, they'll burn fine – just light the biggest piece and pile the smaller piece on top. Note that trying to light a partial tablet in the Graham Cracker support is exponetially harder than lighting a complete tablet. Be aware that removing the tablets from their sealed packaging will make their inherent odor much more noticeable. Use an odor-proof sack instead of a standard ziplok baggies.
2) I have no trouble lighting mine with a Bic. As you have discovered, they are slower to light that one might expect. You have to keep the flame against them for about 5 seconds. That said, Esbits are impossible to light in a wind – you must shield them and the ignition source first. That's the one thing I don't like about the caldera cones; they can't be used until AFTER the tablet (or alcohol stove) is lit. Folks have reported success by putting a small amount of hand sanitizer on the tablet and lighting that. The alcohol ignites quickly and the tablet lights from that.
3)Bears can smell them easily – that rotten meat odor, though faint, is a big draw. I always kept mine in an OP sack in my bear cannister. I have 5 boxes of tablets in my garage, and I can smell them whenever I go near the shelf, despite still being in their original packaging.
4) Maybe I'm just lucky, but having done the JMT and the high Sierra for 3 summers, I've yet to have a bear get interested in my Caldera Cone or stove. The stove is so tiny it's no problem to add it to the bag with the Esbit tablets in your canister if you're worried about it.
5) You will have to send Esbit tablets to yourself along the trail. Very few places carry them. Last summer, I talked to the owner of the Whitney Portal Store and Hostel about them. He was already carrying the Esbit folding stove with its accompanying 3-pack of tablets. I suggested he'd sell a lot more tablets than stoves and showed him the standard box of 12. He thought he'd start stocking those too. Personally, I never take the chance; I always ship them in my supply boxes so I never face the possibility of being forced to buy a cannister stove and cannister because the store was out of Esbits when I arrived.
YMMV
for the rest of you, a 3-pack of Esbits makes a great emergency fire starter that will burn for about 13 minutes each. Think about it.