Possible ARAM changes/New gamemode?

So I feel like part of me doesn't enjoy ARAM much because it doesn't really help me at the core game so I feel like either it should be changed or there should be a new gamemode based around a similar concept. I feel like with the right champions, ARAM can help you improve at big 5v5 mid fights in the core game but due to the randomness I feel like it doesn't help with that currently so I think a team should be constructed randomly based on roles such as Tank, Marksman, Support, Fighter, Mage etc Maybe a dynamic queue sort of layout would be appropriate where you choose your main and secondary role as I feel like I need practice in the teamfights, especially in lower elos where people like to go 5 mid early on. Just a suggestion as I feel like it would actually help.
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