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Link-local addresses are critical in IPv6, and the only way to remove them is to disable IPv6 altogether.
They do not affect routing/forwarding, as by definition, link-local packets cannot be forwarded anywhere. After all, even the local host cannot communicate with another link-local address unless an interface identifier is specified. Packets with link-local addresses only ever hit the INPUT and OUTPUT chain, never the FORWARD chain.
Layer 3 addresses can never affect bridging, as that is a layer 2 function.
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