Some people use this type of magic to create powerful spells, so its rarity is understandable as it has been around since Unlimited Edition
The best way to mitigate the card disadvantage is to incorporate cards that can provide value from the graveyard, like cards with flashback or jump-start
This also helps prevent a single player from monopolizing game time
Spells with split second only prevent new spells and activated abilities from going on the stack until those spells resolve, but once the spell with split second resolves, you're free to interact normally with any other spells on the stack
8 Hermes, Overseer Of Elpis Don't Murmur, Say It With Your Whole Chest As a commander, Hermes hasn't got a whole lot going for him
That would inevitably lead to me playing Opalescence and then finding some level 1 judge and asking them to explain the interaction to me