These are the 3 MAIN ISSUES THAT SEE WITH THE NEW POSITION RANK SYSTEM!!!!!
(Quick look up position ranks if you don't know what it is) First, currently the NUMBER ONE unbalancing factor is actually people playing champs they are new to, rather than position. Me for example, I'm a Warwick jgler main (on my main account) and I hard carry in plat lvl ranks.However, I int hard every time I play leesin and in my silver smurf account i still struggle a bit when i play leesin jg. When I tried Wukong and nocturne jungle I naturally picked them up but still wasn't quite at my warwick jungle level. Then when I tried master yi, i feel like I'm no more than silver 2 lvl just like leesin. Most of the time when people do bad on my team, it is because they are playing a champ they don;t usually play, even though they got their main position. THis happens more often than you think (Just check na.op everytime you play).
Second issue is when people stop caring as much. Maybe I'm not trolling on purpose, but when I try off roles in the new position ranks, I already know that I won't play in try hard mode, like I do in my main role, so isn't this just going to cause more ranked games where people just care less and not try their best in general? Right now I DON'T play support, but when i get auto filled support, I still try my ABSOLUTE best to try and win and of all the games i got support or other roles on my main account, I still did a decent job. HOWEVER if this was position rank and I get autofilled, I def won't try or care nearly as much. This trying new champion issue is not addressed in the new system but will perhaps ENCOURAGE more carelessness in ranked game play as a whole.
Currently playing new champs and players not playing as hard as they can be (Cuz they already reached their goals to get Gold V or Plat V etc) is the LEADING cause of unbalanced games.
Third issue is, legitamate trolls? What If im gold, plat or diamond, but just want to int in another off position to get that new IRON RANK, so when people look at my profile, my rank will be from Diamond, to IRON, just for the LOLs? Lets say, If I intentionally lose 5 games, win a game, then troll another 3, win one, then int another 5 etc, will the system be able to detect me trolling? Because currently the system is extremely bad at detecting inting and trolls. EVEN IF I do get detected and drop some LP in my main position (as Riot mentioned losing too much in a row might affect your main role rank as well), how much does that really matter If I know I got the skills to win that back anyway??? I'll just win 2 in my main position then int more in my off till I eventually get iron.
And a BONUS ISSUE IS, what if I chose an offrole but during select I trade with someone ( thats maybe playing off role as well?) and play my main role instead. I'm Plat jgler in a silver game cuz I was silver adc but I traded with someone now I'm jg and perhaps they are also now playing their MAIN role. Wouldn't that tip the game into our favor by A LOT???
EDIT: To improve, I propose better and MORE DISTINGUISHABLE rewards for every division (Gold V, Gold 4 etc), and can just be a simple one like adding MUCH better distinguishable features on the border for each division. And get exclusive rewards if you are gold or above on 2, and 3, 4 and all 5 positions. Add unique rewards to gold and plat players, then more to diamonds. Rewards can be small from better looking borders, to big, like skins etc. BASICALLY add more rewards big or small the more people accomplish in ranks. DON'T make people feel like its "mission accomplished" once they reach Gold V or Plat V etc, make it feel like the next achievement reward unlock is always steps away. This will reduce the carelessness behavior in ranks, which is the number 1 unbalancing factor imo.
And by "more trolling" and "carelessness" to be more precise, I meant anything from inting, to trying out new champs, to most commonly, playing a troll pick. You already see a lot of this type of trolling happening in flex queue. Leona adc, teemo support, Thresh mid, etc. because people don't care about flex rank as much.