Some of the complaints here come down to skill issues, unfortunately.

You shouldn't be popping bard's LB where you're in a position to get easily swarmed. This was also the case in 7.0.

Dancer's LB has been improved dramatically by the changes because now you're not animation locked during the 2 second window where you can use a follow up attach to extend it. There should be no question that 7.1 helps dancer immensely. If you still cannot do a follow up attack on anyone hit in your LB's huge radius, you most likely fumbled your approach.

On all classes, I find myself learning the timing for registering damage with each attack. Some have longer animations than others. Knowing the animation timing allows me to use my attacks in a sequence which will result in the most damage hitting at the same second, or status effects landing when damage is registered instead of 2 seconds too early.