Mathematical proof that the new rune system has less choices:
New system:
choices for 1st tree = 5
choices for 2nd tree = 4
choices in 1st tree = 3^4 = 81
choices in 2nd tree = 3C2 (3 choose 2) * 3^2 = 27
Total # choices = 5481*27 = 43740 Wow only 43740 choices? I have more combinations when ordering a burger from a fast food chain. Let's see the season 6-7 mastery system
choices for 1st tree = 3
choices for 2nd tree = 2
choices in 1st tree = 63636*3 = 5832 (This is because you can adjust from 5/0 to 0/5 in increments of 1 in the 1st/3rd/5th row)
choices in 2nd tree = 636*3 = 324
Total # choices = 325832*324 = 11337408 We have an 8 digit figure for the number of choices, and that is with a standard 18 points in primary and 12 points in secondary. This is not accounting for 18-6-6 setups and the sort. This is also not accounting for the number of possible rune setups. When you multiply that out, you would get a gigantic number. In conclusion, riot killed more than 99.9% of the diversity in pre game rune/mastery selection.