Actually most jobs and gauges prevent overcapping, the cost and the maximum capacity of a gauge usually has an overhead of two times whatever the most expensive skill for it is. The only exception to that is Monk, which doesn't have any flexibility on using its gauge because its gauge is and always has been terribly designed. You're either full on Chakra and can use Chakra or you aren't full and can't use Chakra skills. Monk/Chakra is actually worse than Samurai/Meditate in this regard though because procs are random so we can't plan around it even in the worst case like having 2 meditation going into a Midare>Tsubame, you'll just cap on Chakra when you're already committed to a different oGCD and you'll just lose an additional random proc if you crit on the GCD after.
We've been complaining about it for years, but we've been complaining about a lot of things for years. They changed Shoha within a patch for you though so they're more likely to listen to Samurai.