flutter_svg allows precompiled SVG files, see Precompiling and Optimizing SVGs.

However, as a developer, you have to add three things to your code:

1. Add vector_graphics as a direct dependency
2. Add import 'package:vector_graphics/vector_graphics.dart'; import
3. Use additionally the AssetBytesLoader class.

With SvgPicture.precompiled(String assetName, [...]) (open for better names) a developer of the package could use precompiled SVG files without the three steps above.

I'm happy to open a PR for that if the Flutter team is open for that.