Says who? The charted approach says to follow the river. It even depicts the route meandering to avoid land areas. They were cleared via the charted approach and cleared to land on runway 33. What's so hard to understand that the approach means to avoid land areas? Fear of banking below 500 feet? (Doing so may be risky, but if the rules are to be changed, then they should have updated the approach.)
I was in a Learjet for most of my experiences there and then a Citation later on. The Lear was every bit as fast as the RJ. We didn't have FMS/GPS navigators to fumble with, though, heck we didn't even have flight directors in the Lear 24D. We just eyeballed it.
Show me where it says follow the Potomac River only to runway 1. I interpret it to follow the river to the airport no matter the runway. The primary runway gets its name in the title, imo:
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I have a TD2 simulator, so I booted it up a while back and cruised in at 160 KIAS. It can be done.