Just sharing a personal opinion really here, however, I feel like the Fated Raids should release as intended. That is, one per week, for three weeks. Although I think after this point, they should all be fated to allow free range of picking which one(s) you wish to focus.
There isn’t much need to time-gate/schedule them on a weekly rotation except to extend people’s play time imo… Will just feel bad as a whole if your guild gets stuck at say 9/10 heroic Nath, than have to restart in three weeks upon reset.
It also allows more time for casual players to pug into groups to progress towards the Fated Mount achievement. As it currently stands, if your busy one week per se, your kind of just out of luck.