Theme App Extension Structure: JS in Liquid Block VS Asset file?

[bishpls]

Conceptually, what are the differences between including custom JavaScript for a theme app extension (app block or app block embed) in the app block's liquid file, versus a static asset file bundled with the extension? 

Similarly, is there any difference between loading a JS asset via the "javascript" field in the app block settings, VS just including the <script> tag inline in the Liquid file? 

It seems like the existence of external asset files is extraneous, if you can just add <script> tags to the liquid file itself. Is the only difference in performance optimization / load time? 

[samporiikkila]

I encountered strange behaviour with including JS/CSS assets through the schema and wrote about it in this post https://community.shopify.com/c/online-store-2-0/theme-app-extension-css-javascript-not-working-corr...

I'm not sure if this is still happening, but including the assets with tags is working with custom templates as well.