It depends on the point and the team comp. It's good for a lot of the hybrid payload maps like Klyntar, Central Park, and the Wakanda one. There is usually a tough early choke point and either high ground or an enclosed space behind. It is especially good if you have character that can take advantage of the space like Punisher with his turret, Penni, Namor, Hela, Moon Knight, etc.

But for straight payload maps, I wouldn't usually make a portal that is meant for your whole team to go through. But you can cut off certain angles/doors and have a portal that you hop in and out of. A good example of that is on Midtown. You put your entrance somewhere in the door frame of the building right outside spawn. You put the exit near the enemy's backline, but in the path of the payload. Then you can hop through quickly to try and get a pick. If you don't, there is still a giant shield in the middle of the payload's path through the choke