Playing a Jim Hawkins or a Moana requires a heavy ink investment, which could see you lose before you have a chance to build any momentum.
The Mox gems, one of each color, granted one mana when tapped, and cost nothing to play, meaning you could have double mana for nothing turn one, and because the original rules didnt prohibit the amount of any one card you have in your deck, early strategies were kind of ridiculous and spam-heavy
While there is a reasonable difference in power between Commander 2020 and the other products right out of the box, some simple upgrades can help rectify any balance issues
Id definitely want to make use of reds temporary mana rush from cards like Jeskas Will, Mana Geyser, Irencrag Feat, and Seething Song to activate that ability ahead of time