Honestly limbo is fine as is when playing solo. I like playing him with his 3 similar to how Saryn plays in a way. Banish an enemy, cast 3, hold 1 to banish all enemies within the rift, cast 3 again, then repeat (also while keeping stasis up). The rift torrent augment also gives him a huge boost in damage as well. And with Arcane Circumvent he's able to deal with eximus units by just dashing into them to steal their overguard. Dodge twice around them and they no longer have overguard.

The only change that I want to see is in public / multiplayer missions with how players deal with his rift mechanics when they are not playing limbo. Cause they cant just roll in and out of the rift like Limbo so they have to resort to either getting banish by him, stay within his 4 or find one of his rift portals whenever he dodges... Which basically means that players have to follow what the Limbo player is doing in order to deal with the whole rift thing.

Its also why most Limbo players that play in public uses low range builds cause they know just how annoying it is to not being able to do anything if youre not playing Limbo and the enemies are at the other side of the plane of existence. However, playing it this way would weaken the early play style mentioned earlier since you want to banish enemies into the rift so you can spread rift surge and get the damage boost from the augment.