I did a little digging, and it looks like this is an exception to the rule. Most bombs are in the "bomb" category of "limit one bomb," and you can't equip a second from that category. It's like they forgot to trigger the fact that it's a bomb, and while they did make it limit one of its own kind, they forgot to put it in the category of "limit one bomb." If it stays this way (which at this point, it probably will, but you never know?), the two different bombs will make a good first hit coupled with lens flare, for sure! It's like how I-Staff and WODF can heal, but are not in the healer category, so you can equip a regular healer alongside them.
At any rate, I got one, just because I'm aiming to have a good variety of icons for any upcoming battling in the plot, both offensive and defensive, in case there's any opponents I can't take out in three hits (lens flare, warlock's rage, freezer). Still wish I'd bought a TTear before the prices exploded, but...ah well.
Now I just have to decide what else to get off the FF store, since the page is back up....and probably spend the rest of my AC points, too. Maybe.