"I hate formations" is fundamentally a nonsensical non-argument too.
The game already HAS a default formation. It's just an impractical, incoherent and aesthetically unpleasing one, where your characters dispose themselves in a ridiculous spread-out pyramidal [PONZI] scheme and keep mixing up the characters order because the UI has no concept of memorizing it, rather than giving you the option to have a practical tight formation that can maneuver practically even in scenarios where you don't have a freaking plaza at your disposal.