You are grossly exaggerating the "shit" dps we do outside of TeB. From all the different monks I've talked to, if anything our damage is still a bit overtuned outside of TeB. As far as knowing when to burst and when to not burst, that's raider 101, managing your cooldowns around boss mechanics. You claiming to lose dps to having to move from something or what have you is the same argument as someone not paying attention to nightmares on Tsulong and dropping it right in the sunbeam because they didn't clear stacks earlier. It's dumb and a raider should honestly know better.
Not only that, it's a 15 second window of burst. There are many, many encounters even on heroic where one can get 15 seconds of consecutive uptime atleast once every 30-45 seconds.
And lastly, the burst change to TeB was to give us the burst we needed to be at the very least playable in pvp (A big shocker, pvp and pve changes effect each other in this game). The number changes to stance and rsk? Changes to prevent monks from being fotm rerolled as they topped charts only to be brutally crushed in hotfixes or 5.3. Personally I'd rather be viable for an entire content patch rather than be crushed halfway through, and the preemptive nerfs by the dev team secured that.