Change is 100% necessary
I look at League the same way I look at any other game. People want League to stay the exact same and that only works for so long.
The best game I can compare League is to GTA, FO and SF.
Old League = San Andreas/ FO3/USF4AE New League = GTAV/FONV/SFV
The newer versions are slightly improved games, while older versions have ideas we loved and wish were implemented into the new design.
I'm 26 years old and I love Street Fighter. I think USF4AE is the best one, but I like SFV for what it is. But comparing preseason S9 LoL to S3 LoL is like comparing SFV to SFII, it just sounds ridiculous.
I don't like a lot of changes that are made and I'm still disgusted by the replacement of the old runes/masteries system (I especially miss my full armor Malphite rune page). Actually, I flat out hate it, but... I understand that innovative minds make the changes to please us, but to punish us.