It's not as simple as just allowing .1 second interval wait times, as marcos still wouldn't work with the ability queue system (i.e. how you can press an ability half a second early and it will go off as soon as the GCD is up) and they're subject to lag, so short of re-building the marco system from the ground up, they are never going to be great for combat, and nor should they be...

While I do sometimes miss certain macro capabilities (and UI mods) from WoW, Rift, etc. I sure as hell don't miss the time it takes to set everything up just so I can play effectively... Are there some shortcomings in FFXIV that 'could' be fixed by awesome macros (and / or UI mods)? Hell yes, but I would rather they spend time making improvements to the abilities, combat, and UI that benefit everyone than waste time making a macro (or UI mod) system so that players can just automate everything and watch Netflix.