Making previous Coil easier (echo buff) may help also people who have already passed it. Players leave the game or their static groups and groups need to find new members. If newly arrived players can quickly get prepared to join the statics, it will be better for all.

It's normal that people who have struggled or are struggling to win something don't like the idea that it will be made easier pretty soon so that other people have it easier than they did. Be it Coil, atmas, relic, Amdapor Keep, Pharos Sirius, whatever. But new people are needed and they have to be able to catch up in a reasonable time.