Please, let the possibility to forward/reply a mail with a different account

I often need to forward/reply a mail from a different account where I received it.

I.e.: I receive a mail at a GMail Account, and i need to forward or reply from the company email account…

In other email clients I can simply choose the sender account with a list box at the “from” field in the mail composing window. The account that received the mail is pre-selected, but I can change it.
Why do not do the same?

Thank you!