"If you are worried about the security implications, why not just install APK verifier and check signatures/reinstall packages from their own releases? Or just delete all packages?" - That is all done already. In my mind a reset would be a bigger level of cleaning out any potential malware, which might hanging on the OS level.
" is this needed? I don't believe so regardless" - what do you mean exactly? Reading it back, I'm not sure if my question was clear. What I meant if I reset my GOS, upon the first boot will Airplane mode will be off, even it is on when I starting the process?
Thanks for the answer btw!