You're hyper-focusing on 1 small part of the overall rotation time. Granted, a lot of your damage is locked up in this short period of time, but you're complaining about 2 casts (that aren't even a full GCD in length) in a rotation of about 10 skills (2 3-step combos + 2 step + 2 short casts). Most of the time, it isn't 2 short casts, it is one (the other should be on cooldown). I'm simply stating that this super tight window you're focusing on can be delayed by up to 5 seconds, which is usually enough time to clear mechanics that are prohibiting the casts (by using the first two steps of your 3-step combos). That will DELAY Midare and putting Tsubame on cooldown, but it isn't the SHUTDOWN period of 0 dps that you seem to be making it out that it is.

And the whole hyper focusing on 2 short casts, that you can clip-move the second half of the cast time through, seems to just spit in the face of literally every job that has to dedicate so much of their focus to trying to maximize their casts (on abilities with much more than a 1.3 second cast). If your problem was truly rampant, BLMs would literally be the worst DPS in the game, and that's HARDLY the state of things right now.

So you can continue to wait for someone to re-explain your more-than-adequately explained position... but at this point, it seems more like complaining about flavor than actual REAL problems with Samurai.