Not really sure what the OP means by poor climbers, but recumbents are a bit more unstable at lower speeds and mainly get a bad rap in climbing for that reason.
Random thoughts on recumbent issues on climbs:
fixed rider position
heavy bikes (generalization)
heavy riders (see above)
The geometry of the seating for a recumbent is generally built around rider comfort. The geometry of a good climbing road bike is generally built around being a good climbing road bike. yes, 'physics' comes into play... but more specifically 'human dynamics'. Standing, spreading around the pain to different muscle groups, etc is extremely beneficial to climbing.
The thought of an hour long grind sitting in some mesh backed fixed seat makes me tired just thinking about it.
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