By reducing the time restrictions on reentry and replenishing tags, they have eliminated the mandatory 50+ day requirement to make a Mythic if you do the activities every ay. Now if you have the gil, you can buy all the Alexandrite, and the rest of the process can be done in a few days of playtime. The biggest complaint about Mythics was that it took 50+ days per Mythic, because of having to do 50 Assaults for every single one.