Probably not at the top of everyone's mind but it just occurred to me as perhaps a little dated.
My suggestion would be to change the tasks required in the Daily Rewards and start by removing the 3x oasis task with something, anything else. For those that play heavily offensive during start game I can see it has advantages, but after v6/7, I couldn't care less about oases unless I'm looking for easy hero XP. After arte's it's especially useless for me. It's getting to the point where it's not something I'd usually do either and now I'm only raiding oases for the 100 point reward (since 400 cp / hero xp is still useful, even though the xp from hitting the oasis isn't). It's also not as easy for defenders to partake in. I realise most have some offensive troops ('cus who wants polite troops), but off for the sake of oasis raiding is utterly pointless and a distraction from what the defender could be focusing on.
Change it to something else. Alter the weighting and remove it completely. I'm not fussed. Change it after day 100 if possible. I just don't want to be raiding oases till plans are released.