Materialistic doesn't crash very often. When I say I have an app crash 5 times a week, I mean any one of my installed apps. If I ever come across a particular app that is crashing regularly, I'll look for an alternative and/or report the bug if the developer makes it easy to do so.

I have a one plus 6 and materialistic crashes almost every time I open it from a previous session. It also often crashes when reading articles even on a fresh instance