Which LOS (Android) Version and Build do you use, its difficult to compare without knowing. Do you use pure LOS or LOS4MicroG or LOS with minimal GApps?
not sure this is due to LOS and such things are more likely due to the Android version.
adaptiv brightness is a problem overall and this is also not necesarily related to LOS and LOS has fixed issues when FPOS had severe issues
I doubt this would differ (a lot if at all) with e/OS (which is btw based on LOS). My system storage with Iode is 9,9GB. Yes on the FP2 with FPOS its only 4,7 however I’m not sure if you can compare this as the FP2 is a complete different device
not sure what you mean here or which camera App do you use? Did you try another camera app like e.g. OpenCamera?
Did you check the Murena Forum for known issues with current version to see if your problems are not the same with e/OS?
for the FP3 there is the easy installer to help with installation, did you have a look at this?
not sure what you are reffering to exactly?
most connection issues are LaptopOS related not Fairphone OS related. Mac is often more tricky from what I read here in the forum and Windows 10 often has driver problems.