I could not understand the reason why U/L bit needs to be complemented? Is it simply to increase readability of overall IPv6 address?
Yes.
(For manually configured addresses, that is.)
It also allows you to specify cool manual addresses like 2001:db8::53 (where the IID is not universal).
-- Pekka Savola "You each name yourselves king, yet the Netcore Oy kingdom bleeds." Systems. Networks. Security. -- George R.R. Martin: A Clash of Kings
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