This is more of a problem with arcade sticks. When doing 214, 5+7 (guard and flip stance respectively) you can buffer the 5+7 after doing 214. If you do 214, 3+4+5, it will cancel if you buffer it and will have to wait for hit confirm. It makes 214xr a little difficult compared to just 5+7 cuz sometimes it whiffs. This is a problem for people who have only 6 button sticks.
To be honest this game really annoys me when played on a stick. I switched to (PS3) pad and I feel like the game was totally built for it. Everything comes out smooth like butter and I don’t need to think for 3 seconds where’s the block button every time I want to defend myself.