It's designed for short haul trips.
The definition of those would have to include surviving for two years in Kazon territory, without known opportunities for replenishing fuel or repairing propulsion systems...
Doesn't mean Starfleet couldn't define "short haul" that way, and "long haul" as something like fifty years between refuelings. Perhaps the Galaxy
class had the latter performance?
The two known Intrepid
missions are fairly similar to known Constitution
missions: ferrying of VIPs ("Journey to Babel", but also adventures like "The Galileo Seven" or "The Deadly Years") and hunting down of rogue space vessels of minor importance (from "Mudd's Women" to "Way to Eden") were tasks assigned to Jim Kirk's ship as well.
Then again, that need not limit our options much, as Picard's huge ship also performed those types of mission on occasion. It's only at the other end of the scale that Sisko's runabouts appeared inferior enough not to serve as VIP transports or credible police cutters...