It took forever to get the blocks and limbs aligned neatly because for the average scratcher, it is nearly impossible to make a new arrangement neatly on a computer. However, Filmer's 5th Numberblock Pack uses blocks that have a size of exactly 1/12th the height of the sprite frame and when you hold down shift and press an arrow key twice, it moves the block by exactly one block! Generation 7 and all previous generations lack this strategy, thus making it very difficult to make neat arrangements.
@Alex_the_Explorer (Note these are not the actual gen 7 versions)