I honestly don't think the change of TP mod to Crit chance will fix most of them to be honest. A lot of the Emp WS are just Tp=Dmg with only a few being Ignore def and the rest being crit chance. I'm not saying I don't think that the TP mods don't need to be changed, just that making them all crit chance won't really fix them.
I do agree that they should be adjusted so that the animations match the number of hits done by the WS, but this would also create a problem where the FTP would need to be lowered or the WS would be much stronger than it is. Especially if Mercy Stroke became Crit Chance TP mod. CdC was found to be 2.25fTP and with a 3 hit chance to crit it does upwards of 7.3k damage without brew and on nm's not weak to slashing nor takes more damage at specific points. Currently Mercy Stroke is rather strong, but it isn't as strong as Rudra's storm which still does 3-4k more than peak Mercy Stroke WS damage mainly due to its damage mod being Dex compared to Mercy's Str mod. So once again, a unified fTP mod isn't the answer nor is turning them all into crit chance. They shouldn't have to nerf emp to make them equal to relic either, they just need to fix the TP mod and the fTP of the relics while possibly updating the number of hits. If no change to number of hits occur then a fTP mod adjustment would be the most relevant, not a separately factored damage boost either like what 90 relics got. That didn't really fix the WS in my opinion at all.