When you create an account with Proton, you'll register using your email address. This email then serves as your username. Personally, I prefer not to feel like I'm logging into my email each time I access Proton. I typically set my username as "drlaggybro," and I find it convenient to use the same username across various platforms and services.

I hope you see this feature request and consider it, thank you for your time.

Best Regards,
Riley Pellerin