It has bilingual typing, but it works a bit different from most keyboard apps. You need to add the second language as a subtype to your main one in the Languages & Layouts settings.

It also has swipe typing, but you need to download a proprietary swipe library and place it in the folder yourself. It doesn't ship with it because it's not open source iirc. It's linked on the github.

The prediction really isn't that great, yeah, but I'll rather deal with that annoyance than use Google software.