UC has issues with this patch and the cooldown of LB is only symptom of them. Now, we did lose Tick Tick Tick… (30% cd reduction) which is rather painful, but Bomb Balm is very good and worth the trade IMO. The other two capstone talents are hot garbage of course and you should never ever pick them.
The bigger issue is that she overheats from damage way too fast. This is due to 1: The loss 20% more overcharge talent from Tier 1, and 2: The enemy attack speed and aggressiveness changes result in chip damage being much more frequent. Combined, UC simply cannot afford to ride heat high because the pool above that is lower then it used to be, and can’t be maintained for as long.
To fix, she needs to either have that 20% overcharge put into her baseline passives, or she needs a reduction in the damage>overcharge formula. Reduced cooldown would also help, 90s would be much better paced then 2m, since that makes it up about once per horde. However, it’s the lesser of the issues and fixing the underlying problem would go a long way on it’s own.