Disagreed, and by a long shot. It's the implementation of independent suspension that determines the amount of travel, not independent suspension by its nature.
For exaples to the contrary, there are a couple of vehicles that I'd recommend you research beyond Wikipedia: the Hummer H1 and the Citroen 2CV / Mehari 4x4. There are certainly others, but having driven a couple of the former and owned both of the latter, they all use non-wishbone independent suspension systems (and note that I don't say 'IFS' because they're both fully independently-suspended) and have surprising amounts of wheel travel as a result.
The real issue with the Patriot's articulation is that it used essentially the same road-biased independent suspension as we've been commonly seeing on passenger vehicles for the last 40-plus years. Had it used something more akin to the almost-portal arrangement on the H1 or the Citroens' leading/trailing arm setup, it would be a very different story altogether. That doesn't mean that it's not capable by any means, however - traction aids can basically make a wheel in the air irrelevant. If they didn't, there'd never be any point in locking an XJ.