@Maximilian-Gerhardt wow! Thank you very much for your response, at least I don't have the feeling like I'm shouting into an empty cave!

I'm surprised at how beta the i2c library is for something that's been out for ~years. I feel like the first feature for boards like this (after GPIO control on its own pins) should be a matured and robust i2c library. Since, almost anything you want to do with them will require i2c communication...

Again, thank you for the heads up with known issues. I'll try to keep stumbling through this and if I succeed I'll make it available.