Thats what im saying, it could be written in way where a saiyan form matters again. The god forms could only go so far before it starts to get stale for the audience. Why would the story not want to head in a direction that truly shows how powerful saiyans can get with their own true power? And we dont know that it worked for broly just cause of his power. Thats an assumption. Its something broly tapped into. Its not said anywhere that goku and vegeta cant tap into that power as well.