Class Battle Actions don't always work

[Jarrell]

I see this happen regularly and find it aggravating as well. I did some research on it and the short answer is: This is an issue with how the FF14 client throttles sent commands to the server.

It's not going to get fixed unless SQEX does a rewrite of the FF14 client to enforce ability queuing beyond 0.5 seconds before the recast timer ends, or removes the throttling done by the client.

For end user workarounds:
-I recommend not trying to hit a new button more than 0.5 seconds (half a second) before the recast timer. For off-global abilities you're mostly SOL, just cast on next recast.
-Also, if you are using macros, even the 0.5 second before recast ability queuing doesn't happen.

More on the 2 above points in this article: https://www.reddit.com/r/ffxiv/comme...g_your_skills/

My wild guess is this has to do with cost concerns as SQEX probably pays for bandwidth at their server hosting, and removing these limitations would result in a lot more data transferred by the client to the server, with mostly redundant commands. So there's probably not much motivation for SQEX to resolve this.