Then why were the Ancients using (and building) stargates well after development of both ZPMs and hyperdrives? Like, say, inside Pegasus itself? And there's nothing subpar about the stargate on the Destiny or the seeder ships. The only limitation is power requirements. They're not limited in range in and of themselves; the Destiny's power reserves are.
And yes, the Destiny uses stars to refuel and doesn't have huge power reserves. But there still is no proof that the FTL drive it uses is significantly slower than a hyperdrive; it's just a completely different type of technology. Like going from diesel engines to electric engines. That doesn't make it faster, just more convenient/safer/cleaner/sophisticated/etc. Primitive != grossly inferior.
Case in point: What other Ancient technology has survived in such harsh and unforgiving situations for as long as the Destiny has, while remaining at nearly full functionality?