That's what Ikari is based on you idiot. False/Pseudo Super Saiyan was originally intended to be the Super Saiyan design, but was renamed when Toriyama gave Super Saiyan yellow because Toei had went ahead and did his concept for Lord Slug.
Hell you can see Broly do False Super Saiyan/Ikari in the first Broly movie when he's destroying planets left and right when he was a teenager. Just the same as Legendary Super Saiyan was based on USSJ F. Trunks.
That is the original Super Saiyan and the original Ikari. It was never meant to be accessed normally like how Super Saiyan is now, it was meant to be a last resort rage thing originally.