This is a very common scenario at Microsoft in the engineering team, and I stumbled across this while setting up a flow for the HRA team, which sits behind an inbox.
I want to create a Flow that triggers when a new email arrives. If the email contains keywords related to someone's specialty or expertise, I want to Reply All and add that individual to the "To:" line. The current Reply to an email trigger only allows you to send send a Comment and select "Reply all" or not. The current work around is to send a new email and copy all the contents from the trigger, and include the expert on the "To:" line. I hope that the connectors team expands this capability for Reply since it's such a common use case!