LOC is a bad measure of literally anything. It's not related to productivity, efficiency, bug count, readability, etc. What it's most related to is the choice of language and libraries. For me, shunning big contributions just for being big just stifles my drive to contribute. If the solution does what it's supposed to, is valid, efficient and there's no obvious unnecessary duplication of codethen who cares if it's big. All valid contributions push the project forward.