As with all things pond related, 'it depends'. Having a fairly steep drop off on the pond margins limits the areas shallow enough to have adequate sunlight penetration for plant growth. This means less 'weeds', depending on how you define that. The tradeoff will be in cover loss (less plants means less cover for small fish and creatures that form the food chain); also, spawning areas may be less than ideal for some species of fish. So....it depends.
