I am not a regular app user (I prefer my stuff on browsers) and I'm finding it excellent.
easy to use, fast, simple and functional and I absolutely love features such as "make texts selectable". it's infuriating when apps don't allow that.
imo it doesn't need to get much more complex than that... nowadays most mobile devs simply don't care about performance and target only high end devices
It still need features. 85 issues about enhancements on GitHub approve it. But it does not mean it will be complex. If everything will be done right performance would be nice.