Unfortunately, the "Rapid Application Development" thing also seems to apply to the library itself: you get a new release every other week, and stuff breaks in somewhat unpredictable places. So it's easy to prototype something with Textual, but hard to maintain it afterwards.
I get that this can be annoying (as someone who maintains code written using Textual, I very much get it), but while we're still 0.x we are making the most of being able to steer in slightly different directions if a more beneficial approach becomes obvious in some area.
We also try really hard to highlight breaking changes when a new release is made.
And, of course, if anything particular is tricky to work around or get working again anyone is welcome to seek some help in GitHub issues, discussions or even on Discord if that's your thing.