It's great but it just... isn't there yet. It's missing some core features from the desktop website. Seek is a better-made app that strips most of iNaturalist features to basically just make it a species identification app. Not sure if your observations even end up going towards citizen science initiatives like the main app does
The team behind iNaturalist is like 6 people (though they're hiring! I wanted to apply but it seems like they mostly need help with DevOps)