If a card just says "Partner" or "Friends Forever", its benefits only really apply to the Commander or Brawl formats, where you're allowed to run two Commanders that share a keyword
Of course this may not make a lot of sense, if you have a host of enchantments on the board, because then it could take you some time to rebuild, and it may just be better to let one of the cards go, but it is a relevant feature
This trend applies to lower-value cards, too
For what it's worth, it would've been strange to see people constantly flicking cards at each other, so, in the end, this was probably a good call
This makes Snapshot useful well beyond standard proxies players design custom cards, joke cards for friends, and personalized alters that don't exist anywhere else
Giant Mantis from Mirage turned Giant Spider into an Insect, while Towering Indrik from Return to Ravnica turned it into a Beast