I am not a fan of bots, but if they have cards they can use them. The thing is to not give them advantage over human players. That's why rating system was changed from old (winstreak, min +10 per win) to current one (no winstreak above league limist, min +3 per win). So right now playing a lot of battles does not give you an advantage. It's the winrate that matters. Last season Bronze, Silver and Gold leagues was not super competitive, so strong accounts actually was able to get a lot of points just by playing a lot, but it was because of really high winrate as a result of not too much strong opponents.

I think there will be more and more strong accounts in each league over time, people need a bit of time to adjust their strategy to the new system. Before there was no incentive (except tournaments) to have a strong non-champion account.

The season end leader rankings should take into account the persons DEC recharge rate. I have been thinking about an acceptable range but I think over 60% DEC recharge rate should be counted. Anything below 60% DEC rate would be exempt from receiving packs in the end bonus

I don't think it's a good idea. What if someone plays 2000 battles in first 10 days, then let ECR recharge and then plays 20 battles last day? Still is above 60%. So maybe limiting amount of battles per season would be better? Like 500 battles per season? Well, then people that care only about packs would play most of their battles the last day, which is the most important and you gain points faster (because you opponents have more points than you).

If there is enough strong players in each league, playing more does not give any advantage. So .. we just need more players :)