Agree entirely with that.I don’t think should make biassed comments to a team coach off the pitch no I don’t.
As they are there to ref the game to officiate on the rules no to give comments on the fitness or strength of our players.
To comment that a player "should be stronger" is the Ref saying the reason the goal happened was because the Goal Keeper was incapable and should have gone in harder to get the ball.
Its the refs job to referee.
The ref is inferring his decision making is based on his "personal opinion" [not "professional"] by commentating on the strengths and weaknesses of individual players.