It's great when the commander shares the creature type your deck cares about, and the mana bump it provides helps cast those over-priced Octopuses and Leviathans, which in turn get Arixmethes closer to waking up
For flippers and investors, grading is a key part of the process
This includes cards in hand, cards in the graveyard, and exiled cards
If you have more land than your opponent, or if your spells are cheaper than their counterspells, or if (as above) you have instants to lead with during their end step, it can pay to save threats in hand until they exceed the number of solutions your opponent can pay for, regardless of if they have them
This is exactly what theyve incorporated into Commander 2020 and I, for one, am a fan