Not OP but I avoid default exports unless I need to do a lazy import. For me, there's a few reasons: consistent naming, easier importing, encourages importing what you need, avoids weird situation where you do both a default and named import.
Consistent naming: since I named the exported thing, that's what the consumers will call it as well unless they go out of their way to do `import { X as Y } from '...'`. This is useful because it helps ensure all consuming code looks similar at least in it's usage of modules. More familiar code is easier to read and reason about. It's also useful for looking up usages of something. I know I can run $IDE's version of "Find Usage" but sometimes it's easier to just Ctrl+Shift+F > X.
Easier importing: If I have something exported as X then I go to a module that isn't using it and I type X, my editor will suggest I import it from the appropriate module. This _can_ work on default exports but only if you use the same name as was used internally at the point of definition. That kind of defeats the benefit of default imports where you can use whatever name you want without hassle and it's your responsibility to make sure you match the names correctly.
Encourages importing what you need: when you default to named exports, you default to pulling in the bare minimum to do the job. Consider the opposite case. Someone imports some monolithic chunk of code as a single object then does `library.thingIWant` with a bunch of different things. Now you've got a larger possible space to look at when trying to load all of the context of a file in to your head. This is also useful for tree shaking. Assuming you've written your code in a well-defined manner and are using a smart build system, it can more easily eliminate dead code because it knows you never import certain pieces of a module. This applies to both your code and code from third-parties.
Both default and named imports: This is common when working with React. You'll see `import React, { useState } from 'react'` or similar. I don't have a rational answer for this but it rubs me the wrong way.
