when you purposelly play "below" your real level, you just waste your time; and the match session does have no purpose, it losts the goal/objective, and ending not working even as a simple sparring training ....
Real fighters don't go 100% when they spar, so explain that one :-p
It's about what your goals are, and who you're playing with. If I'm playing my cousin who I've trash talked back and forth countless times across every conceivable activity? Yeah, I'm going hard in the paint in the game and in his ear. Expect that pop off when I win, because I know it's coming if I lose!
But if we are training, if it IS sparring (good analogy), it's best to not do that. I think of it as Sandbag by Meta Level. Don't dunk them with tick throws, because they don't even know what that is. Don't frame trap when you're barely plus, they don't know frame data. Win by spacing, neutral, fundies. They will respect that and can learn. Once they have meta level 1 down, you can start introducing meta level 2, etc.
Or you can just curb stomp, lol. But you're not accomplishing anything but beating up on someone who can't properly defend themselves. If my 4 year old nephew laces up some gloves and boxes with me, I'm not going to launch his ass into orbit and yell "Get Gud!" as he passes the International Space Station.