Main issue here is that having a set multiplier really complicates scaling and makes our current ones sort of illogical. For example we currently assume Jiraiya and the other Sannins to be Bijuu level (most Kages, like A4, and Hiruzen, are considered Bijuu level. Sannins are considered Kage level, one of them being an actual Kage), is SM Jiraiya going to be 10x stronger than Gyuki? Also, SM Naruto is said to have surpassed SM Jiraiya, this would mean that SM Naruto is ALSO 10x Gyuki. Which is bizzare given that KCM Naruto who is stronger than SM Naruto is still comparable to Bijuu Mode Bee/Gyuki.