To start, I know ppl do coil for bit of stat "balance" but i believe this is just a lie. People do coil to get the i90 drops AND for the boost in accuracy to move on in turns.So since it takes even 1.5 smth month to get the full build with myth gear,including jewels, it's pretty balanced enough in comparison to the coil gear which you can get much more often by doing multiple runs.
To sum up, myth gear overall gives boost to skill speed and allagan gear boosts accuracy. Problem is that accuracy is the "ticket" to enter coil but myth gear serves no actual purpose right now. So if i get filled up with myth gear i wouldn't be able to enter coil? because from a simple calculation my acc would be about 425. In the worst case scenario, from the confirmed statement by Yoshi that there will be an increase in coil turns i hope there will be a new instance-raid that will not require a cap in accuracy and more "free" in terms of stats that gives top gear or the new currency to get the top gear.