It doesnt look as good for Elo to be based on masteries used since they can be changed at any time to not be meta as they are now. If tai/med suddenly gets changed into being teamfight mastery are you gonna be rebalancing "elo" gains when every small balance update comes out and suddenly its busted 1v1, who decides these things? Sounds stupid in bigger picture.
- I feel like world is very small overall and feels closed. It's really easy to block maps without there being any other way even if it would be longer one. You are Leafie and some group camps mini with people in your village being offline? Good luck playing, theres no way around mini, other than just wait.
- Mentioned character progression is another thing, we hit 60 and now what? You finally got out of 3 daily mission hell cycle and now you can... Okay you can go out and pvp, farm bandit drops or try gaining some rank in village (if you didn't already pre 60). Achievements would be nice, with some rewards from different chakra charging color, titles, some cosmetic items to changing visuals of your summon.
- Might be just me, but I found bandits Bandits, Manda or even Spider boss discouraging to do. Farming for hours without any drop makes me want to stop and do something that makes me go forward in any way over killing bandit with no mechanics whatsoever that doesnt drop anything for hours. Giving them (not only bandits but bosses overall) at least 100 ryo on death would be step in good direction in making player feel he gains at least something over just losing time.
Tldr.: World is very small closed, no character progression (other than village ranks), doing "endgame" content aka farming bandits or tower in LoI feels discouraging