A lot of the time, there are cards that havent evolved yet
It allows you to sacrifice problematic cards if they become a burden, such as Bitterblossom after you drop too low in life
If your deck's key engine is a 4cmc commander like Kaalia of the Vast, for example, then you will want to run ramp cards that can get her out faster, which means ramp that is between 0-2cmc so you can cast Kaalia on turn 3 or earlier instead of her usual turn 4
Not a very exciting option and certainly not one of the best picks, but a serviceable option C- Smog Elemental Six mana is a lot to pay for a 3/3 flyer, but it also takes care of opposing aerial threats
There's a lot of inconveniences and issues that come from trading with people that are just not present when you deal with stores
Players will now have to hold onto their tools until a more opportune moment, instead of filling their benches with Rocky Helmets