Just keep asking, when in doubt,SE may grant your wish one day...
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Ability to double-weave depends on one's ping. I could double-weave fine even under Enhanced Arrow (1.68s GCD) in Stormblood so long as I was playing under VPN (otherwise, despite living next door to the server, ping was over 40 and packet loss was terrible).
Moreover, if SE would just stop resetting the animation locks of skills upon server verification and would allow for all oGCDs to be queued, anyone and everyone could double-weave at any GCD of 1.5s or greater, since each skill has an animation lock of only .5s. (The problem, again, is server verification restarting that timer, making it effectively .5s + gap to next server poll + round trip time + one frame's delay, because of how wonkily this game is coded.)