Getting to draw cards and create Treasures is great, but not at the expense of losing this creature that you already spent your mana on
/ Neath the darkness, nightmares grow. Childrens nursery rhyme Illustrated by Diana Franco Standard Legal Alchemy Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp
The sac aspect is relevant as well with their being relatively few enchantments (therefore able to hit the right one) and some of them being indestructible
It also encourages you to, you know, attack your opponents and play the game, which many of the EDH pods Ive played in could use
You have infinite ways to express yourself, from the Commander you pick to the cards you put in the 99, the win conditions, the removal, the ramp its all customizable down to the last detail, and thats even before you consider what basic lands to pick, what foils and showcase arts to choose, and even your sleeves and deckboxes