What the game actually lacks to not get boring
one word '' Customisation '' or if you prefer personnalisation.
What do i mean by that ? in the past we were allowed to choose a variety of runes masteries and stats.
The actual rune system doesn't allow us to add effects like the quintessences.
In the past you could play many playstyles that werent considerent trollss like full lifesteal nasus or olaf. You could do full attack speed yi, vayne etc... You coud extend some stats.
Nowadays we have no choices and we are all playing the same way... if you try other things it won't work so well because of the lack of customisation.
The actual state of the game isn't in a good shape of balance so why even care if personnalisation is a mess to balance ?
i'd rather have fun while trying funny builds than being bored always playing meta things in an unbalanced game.
The old system was way more have fun friendly in a way you could do what you want because you had many ways to play the same champion.
remember kogmaw ap ? Sion ap ? Malphite AD etc...
riot is killing diversity and the actual game isn't more balanced...