Personally I see this on jobs I play such as dancer where I can not press the next actions until the server responds.
This is a difficult problem to solve, but I hope a better solution can be achieved.
Some of this has to do with anti-cheat measures to force the client to wait until the server says it is OK to resend the next command.
What really needs to be resolved is the lag issues, which have been reported in other threads, and I believe this will also resolve these issues.
But, even if the client was able to send data to the server without waiting for the response... the client would eventually get queued up with many packets to send the server and will be playing "catchup" so some of these measure are also to assist with stability issues. How many packets can the client queue up, or how many packets can the server handle if it receives a "burst" of queued up packets?
This happens a lot with me, and the only thing I can to as accept it as it is, the game is still playable but there will be issues with DPS and being able to perform "rotations" optimally.
Personally I accept it as there are times some routes in the internet can be flakey or inconsistent with response times do to the very nature of the internet and data packet congestion.
Ultimately I believe the server lag needs to be addressed, which is very difficult to identify the root cause, but I believe it is being looked into.
With issues in the housing system now though, attention appears to be spread out in the dev team to address other issues as well.
Here are a couple threads that are in a response to the latency issues.
You have not provided a system report so we can not see which client you are using but here are some related threads.
Please do specify your platform, as some bugs like this can be platform specific at times, if not provided this may be moved to "not enough information."
Please also search a little to see if the bug (or similar) has been previously reported before posting a new one, this helps alleviate the load on the community team whom review these.
PS4 (accepted for review bugs)
https://forum.square-enix.com/ffxiv/...in-Aglaia-Raid
Windows 10 (accepted for review bugs)
https://forum.square-enix.com/ffxiv/...ed-after-patch