Not required. With mobile app development one of the biggest pain points is deployments to the app stores, it's a little easier with Android but on iOS it's an absolute pain in the ass and fastlane makes it a much more tolerable experience.

When it comes to webapps it's a much more straightforward process. A simple github action that deploys your site to S3 would suffice. On mobile you have a billion certs, profile, and other crap to deal with and fastlane handles all of that.