First of all, I know bots still need a lot of work (and also that this may not be something devs will prioritize for now), but anyways...

In Assault, when bots have low health they walk all the way back to the fountain and remain there until they get full health again, so... you end playing alone. Only tanks that have about 40-50% health stay next to the nearest tower and go back to fight when they get some more health.

Also, warrior bots won't hit towers, instead they keep walking against them.

Considering Assault's meta is that everyone (usually) takes Meditation Cloak, you could make that all bots take it as first relic and that they use it once they have low health and are waiting at the nearest tower.