IDK, we should think if we would think its reasonable to add SMTP or IMAP protocol support in browsers, or if this move would be perceived as misguided, by bloating even more with things that should otherwise be optionally implemented in other layers.

For me it just look like the right thing to do. I think we should be more suspicious when the parent company have some interest in deprecate some technology giving they interests clash with the technology being available or promoted.

FTP is becoming obsolete? yes

Google might have a clash of interest with some product over FTP? no