Only at a very narrow layer, and only if you’re also installing a custom AOSP build. Want to fix a bug in any of the hardware interacting modules like drivers?

Only at a very narrow layer, and only if you’re also installing a custom AOSP build. Want to fix a bug in any of the hardware interacting modules like drivers? Not usually possible because you can’t modify binary blobs. Instead you need to modify the parts interacting with the driver and hope you can get a workaround. Want to modify the apps? Most of the apps people use are closed source , including many that people take for granted as being vended by the OS. So that’s also moot unless you stick to FOSS apps only. And even then, to go AOSP, you’d probably lose access to a majority of the differentiating features of your device. At the end of the day, yes, you can MAYBE fix a small section of bugs if you have the skills and are willing to make a lot of compromises as well. It’s not as cut and dry as OSS makes it sound