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Even if you're not lucky enough to be playing against a token deck, it's incredibly troublesome to track -1/-1 counters on creatures and every player with a creature on the battlefield will have to do so

Generally, the Doctors Companion mechanic will only appear on the Companion characters, who have all been monocolored Legendary Creatures at the time of writing

And it allows players to use a designated Commander card to lead their decks

While it can be dealt with cleanly by a Swords to Plowshares, assuming you managed to hit a creature or planeswalker of theirs, they would have paid three cards (Swords, discarded card and creature/planeswalker) for your one (Entomb/Faithless Looting and reanimation spell offset by drawing a card)

However, it also pings players whenever a creature enters the battlefield, further adding to its ability to wreck opposing life totals