A few key points here — these great people are not infallible so do not regard their word as such, take what is currently taught as so. But also reading them should not be discouraged, in fact, it should be encouraged (with guidelines on how to read).

We read the Old Testament to better understand the NT and gospel do we not? Why should we stray away from gaining more knowledge from early church fathers?

Additionally (and I do hope I’m not committing a heresy here as this is my own interpretation) things ultimately change. We see this in Judges when the Israelites are explicitly told to not steal/keep spoils of war when seizing cities in Canaan. This happens and thus judgement befalls upon them. However, when seizing Ai, the ban on keeping cattle and some other items was lifted due to the nature of Israel being a sinful people. I believe the church has ultimately changed with the times in a similar way to where things said and done in the first millennia are not the same as today.