easy explanation on how to kill Echo of Lilith:
https://youtu.be/UqVTlkhgZAA
How to cheese* uber lilith, fixed that for you. The fact that nearly nobody can kill her without cheesing the mechanics with a broken build, shows just how badly designed that boss fight it.
totally agree. even in video above at the end it is a complain about this very bad Lilith mechanic.
the fight should be a balance between damage and defense, e.g. to have a time to kill her but to be able to survive her attacks with a defensive build so you need to balance defence/damage to kill her in time.