Centralizing around proprietary software is not a good idea generally.
Git is distributed, so when GitHub goes down, every developer has a backup of entire history. However, issues are lost forever. Python does not use "issues" feature for good.
One way to avoid email without centralization is setting up Gerrit. That is how Ring [1] and LineageOS (former CyanogenMod) [2] manage their "pull requests".
Still, being able to submit patches via email is an absolutely necessary skill for everyone who considers himself a hacker. Lack of it makes you unable to contribute to many great projects, such as all suckless [3] projects and Linux itself.
Git is distributed, so when GitHub goes down, every developer has a backup of entire history. However, issues are lost forever. Python does not use "issues" feature for good.
One way to avoid email without centralization is setting up Gerrit. That is how Ring [1] and LineageOS (former CyanogenMod) [2] manage their "pull requests".
Still, being able to submit patches via email is an absolutely necessary skill for everyone who considers himself a hacker. Lack of it makes you unable to contribute to many great projects, such as all suckless [3] projects and Linux itself.
[1] https://gerrit-ring.savoirfairelinux.com/
[2] https://review.lineageos.org/
[3] http://suckless.org/