Pitching from the stretch with no runners on

[Casady1]

should be outlawed. I was watching LA- SF last night and both starting pitchers did it. Talk about slowing down a game.

[OAITW r.2.0]

1. I would think that would favor the hitters.....and thus prolong the game even longer.

[Clash City Rocker]

2. It adds velocity to the pitch

Why would it favor the hitter?

Edit: it also makes it harder for the hitter to see the ball as it leaves the pitcher’s hand, thus making it tougher to know what pitch is coming.

[ProfessorGAC]

3. How?

Not getting the physics of getting more velocity from the stretch.
Also, how does the stretch make it harder to see the ball? Given the arm movement & turn with a wind-up, I'd think the opposite would be true.
I've delved pretty deeply into the physics of certain sports actions (shooting a basketball, getting ideal transfer of momentum from a golf club to the ball, et al) but, I'm not seeing the physics behind your claim.
Why do you think this?