is the execute command broken?

I feel like the execute command is broken now. when I use this command "/execute @a[score_Build=1,score_Build_min=1] ~ ~ ~ /fill ~2 ~-1 ~2 ~-2 ~-1 ~-2 grass" it fills where the command block is. In 1.11 it was where it would execute the player.
I have an idea to fix that though.
When I see ~ ~ ~ I think "where ever they are." so maybe you can add a new command option for execute such as
. If you don't include ~ ~ ~ it will execute the command block
. If you include ~ ~ ~ then it will execute the player
. If you don't include ~ ~ ~ but you do include "detect" then it will execute the command block.
. if you include ~ ~ ~ and "detect" then it will execute the player.
I mean, this may be intentional... but I just don't like it.
How about this though... what if you use "@s." For instance:
/execute @a ~ ~ ~ /execute @s ~ ~ ~ /fill ~ ~ ~ ~ ~ ~ grass
That will execute the player
/execute @a ~ ~ ~ /fill ~ ~ ~ ~ ~ ~ grass
That will execute the command block.
Please fix this "bug" unless its not one...