Good in the sense that it is easier to clear, but it blatantly make bad players stay bad because they learn nothing out of it.
Even in it's nerfed state there is plenty to learn in T1-5. The notion that people learn nothing with it nerfed and with the Echo is quite frankly, a bunch of BS. It's still harder content than anything that comes before it, maybe with the exception of the EX primals. Just because you see bad players doesn't mean they're eternally stuck in some state of being terrible, without ever learning anything.