Personally I'd rather not.
As somebody with 1.6 million on Elise, I'd rather the game not announce how much I play the champion to my team or theirs.
Reasonings:
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say there's a /remake and then they target ban you assuming everybody queues up the same time, I've had this happen many times (nobody just bans Elise in low diamond and when they do, I was in the previous lobby before dodge or remake). This is something easily abusable in higher elo and personally I pay attention the same way (if I see a guy with "thresh main" in my champ select lobby, and then dodge, and then I get in a new lobby immidiately and I don't see them, I'll ban thresh right there and about 80% of the time I was right and it either results in another dodge or them on something with lesser chances of winning). Its scumbag but its truthfully the best call to do from both ends, and the reason why I don't associate elise in my summoner tag at all and got rid of my club tag.
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over expectency, I've had many people literally flame me for not 1v9 carrying and call me useless trash that wasted time, or the enemy team getting cocky off of counter jungling 2v1 mid+jungle and bming with "main?", even if I'm fed. Occasionally I'll get a player, especially in norms that just watch me instead of playing the game. Its cases like these I don't want my or the enemy to know about my experience because I'd rather let the performance dictate my skill expression then the number, which from the start makes players have an eye on you and every little thing you do, even if its right and looks wrong to them.
Even if I do go 11/0/11 I'll still get /all shit elise, fed only cause bad top laner.. so there's really nothing I'm willing to show for pride when the community takes the pride away.
- "alpha affect", basically encourages me to play at my best to show off and go ape shit, which either leads to forced bad decisions or makes me starve a team etc. Kinda an individual personal problem for me there but I wonder if others have the same effect as "Lucian: Oh damn, a riven otp! you better be good, Riven: EZ PENTA INC"
Maybe something for your profile, but anything in-game or loading screen please no unless you can option to hide it, I wouldn't mind a cool banner on my profile so when people check me it immediately lets them know rather then them having to hover to see the number itself, but interaction about experience should be left alone. I wouldn't mind an icon for the thought however, just to say I have it.