Broad questions waste people's time and are costly in attention. If it's one that also sparks of debate and back and forth, that's not ideal for the Stack Exchange software, designed to deliver definitive and authoritative answers to well thought out and concrete questions. Being broad is ill-defined and unsuitable, much like one lacking any value information is not a real question as people would just be guessing.
That question in particular is not meant to kick off discussion.
It was one requiring some extrapolation on whether or not terraforming, an oft-used device in science fiction, requires the planet to be solid in order to work. Some extra leg work was required.
Ideally the best answer for that question would be one where you would cite or research different/multiple franchises and properties to definitively say that yes, or no, it is possible to terraform a planet that isn't your standard rock base like Mars.
What it's lacking is a franchise to tie it down to to make it easier to look up and point to a single source.
It's not a question meant for those who want to answer with a single link to Memory Alpha or the Flash Gordon database.