I’ve found plenty of time to blast this season. Sounds like you’re pugging and your groups aren’t equally contributing to add control and or group wide dr’s. Interrupt’s are off the GCD, most classes only get one GCD spent on aoe cc every 30-40s, lots of time to blast in between.
Aside from CoT and Grim Batol being tuned far higher than the other keys (GB timer sucks as well), I honestly don’t mind m+ this season. It’s not revolutionary but no sanguine or explosive affix is heaven. The scaling does hit hard above 12 though.