Why is everyone in TWOK "OMG! You can destroy a planet with that!" about Genesis? So what? A few starships can destroy the entire inhabited surface of a planet; and, in "Obsession," Kirk et al showed us that an ounce of antimatter would "rip away half the planet's atmosphere." Personally that seemed to me like a huge overstatement of the effect of that much antimatter, but still--obviously antimatter isn't so hard to get together in the 23rd century. If not an ounce, then probably 10 or so 1-lb-of-antimatter bearing torpedoes would do the job.
I wouldn't doubt that Starfleet has other means as well to destroy whole planetary surfaces (as well as the Klingons, and the Romulans, etc.), but antimatter is the obvious method. After that, a few capital ships' weapons arrays (for that matter, one ship alone can do the job: see "A Taste of Armageddon.") Why such a hullabaloo about Genesis?
I wouldn't doubt that Starfleet has other means as well to destroy whole planetary surfaces (as well as the Klingons, and the Romulans, etc.), but antimatter is the obvious method. After that, a few capital ships' weapons arrays (for that matter, one ship alone can do the job: see "A Taste of Armageddon.") Why such a hullabaloo about Genesis?