You lose games due to comp regardless of gametype. It's a fact of life in League, not a reason to deny others additional options. if there were bans, you could definitely cut that back further, as well. However, theoretically there could be an algorithm based off a wider win-loss margin that mathematically provides leeway for the probability of comp losses. Although, as an afterthought, this could be cut out altogether if they scored each champ individually based on success of role for instance if you have Nautilus, how well you tanked and supported the teams pushes etc would be factored in more heavily or HOWEVER Riot can fairly work out to do it. I believe in them. They can do this. Also, I don't know about you, but I've won plenty of ARAM games against murderous comps, turning the game around with teamwork and build changes. It's a STRATEGY game. Become a master strategist or just don't play the theoretical game type. Ive not seen a real objection yet with any substance to it....
As far as the account issue goes, that same paradigm exists for 3s and 5's as well. It's part of the game, nothing to cry about, just another angle for YOU to strategize from... Or not.