That is not a fair comparison. Gzipped and minified underscore is 5.7kb. Lodash is 17.3kb. For the vast majority of sites that is a trivial difference in size.

That is not a fair comparison. Gzipped and minified underscore is 5.7kb. Lodash is 17.3kb. For the vast majority of sites that is a trivial difference in size. Both of which are linked from the front page of their respective websites.