Reducing Standard Cast Times (not recast time) to 2s

[Shurrikhan]

For those asking for a full weave-space, consider -- When all spells clip, you're as able to place oGCDs into any GCD as any other. You can also use them during forced downtime at effectively no uptime cost.

At present, all but AST has either full casts or instants (double-weaves), and those instants are on decently rare intervals (twice per 30 seconds for WHM via Lily/Dia, + potential Regens, for instance). This means there will be large windows where the oGCD itself can be implemented as the stutter-step, albeit at cost, but in exactly so far as is needed. AST, on the other hand, is obliged to use one and only one oGCD per GCD outside of Combust or AB. Both are likely mostly balanced around woven oGCDs, of course, though perhaps likely AST more tightly so than WHM, but WHM feels just a bit... freer in any particular emergency scenario than AST does precisely because those oGCDs aren't so strictly paced if you'd need movement anyways but not for more than a single oGCD's time and Dia and Regen are each too recently paced (though that, too, can be considered a failure of play).

Simply put, if you allow for weaving, thereby providing a potency over time spike as AST received in SB, expect to be balanced around that. So, exempting hidden/accidental healer dps buffs, that leaves just gameplay changes for the non-ASTs. Personally, I both find weaving oGCDs (and movement) into my instant casts more exciting and not being constrained to a one-oGCD-per-GCD pacing more freeing on non-ASTs, than I would if every job borrowed AST's 1.5-second casts.

Allowing a weave would improve play-feel—especially on WHM.

For me, at least, giving free-weave casts to non-ASTs (especially WHM) would do less to improve play-feel than to reduce the signals of good performance which in turn made play more exciting.