Cards which "make no sense" in the current decks often end up seeing play a few months later as the meta shifts. For example, Twisting Nether and Lava Shock are

Cards which "make no sense" in the current decks often end up seeing play a few months later as the meta shifts. For example, Twisting Nether and Lava Shock are currently run in competitive decks (without having been buffed), even though they were considered unplayable and badly in need of buffs not that long ago. If they take the worst cards and give them a small buff, they will still see no constructed play and everyone's time is wasted. If they aim for actually making them constructed quality, they need to do as much balancing and testing work as they would do for new cards to avoid them being overpowered, in which case they might as well spend that time developing new cards. FWIW, "strictly better" cards existed before Magma Rager, for example Dr Boom is very popular and is strictly better than War Golem.