I suppose. Or just use a polyfill for old browsers. It increases your code size a little, but at least the bloat is temporary.
https://github.com/github/fetch or https://www.npmjs.com/package/fetch-ie8
https://github.com/github/fetch or https://www.npmjs.com/package/fetch-ie8
I believe that jQuery is not "modular" enough for today's web development environment. The "light" version is a step in the right direction but it's not enough. If one could configure the "modules" needed and download/load a single file/library, it would be tremendous.