Fine. Sorry for calling it major design flaw. But I'm glad I brought some attention to this issue.

I appreciate Idle Master now launches games simultaneously to get them to 2 hours playtime first, but the way it's designed right now, it simply wastes time. Why? Because it keeps going back to idling games to 2 hours every time I get a new game instead of finally finishing up those it already got to 2 hours.

Here's the problem: I don't run Idle Master 100% of the time. I let it run, I switch it off to play some games on my own, I launch it again, etc... In the meantime I get new games in my library. So many bundles and freebies, they just keep coming. So when I launch Idle Master again, it suddenly notices some more games need idling to 2 hours and it launches for example 2 games at once. Yes. It's not a lot. It's 1, 2 or 3. But games can be brought to 2 hours in much larger groups than 1-3 games at once. Soon if another game pops up in my library, it will try to idle that one too instead of doing those that already have 2 hours of playtime. It keeps wasting these 2 hours over and over again every single time instead of finishing up the work already started.

If it focused on first farming cards from games with over 2 hours playtime, a larger group of new games could accumulate in the meantime and they could get idled to 2 hours all at once later. Instead of that they just get idled as they come whenever the program spots something new on launch, even one by one in extreme cases. It doesn't differ much from the old Idle Master that way.

I looked in Idle Master's options and I noticed it's possible to switch it to the old behaviour to simply idle everything one by one, but no matter which option I choose, it doesn't solve the main problem, which is: I don't want to idle games with insufficient playtime yet, I need to finally finish those I already got to 2 hours. Before new games come and distract Idle Master from finishing the job again.

Please consider fixing this. The efficient order of idling should be:
1. FIRST idle games with over 2 hours playtime one by one if there are some already.
2. SECOND if there are games with less than 2 hours playtime, idle them now in bulk. (Otherwise idling finished)
3. Do step 1 again to take care of the games prepared in step 2.

That way if Idle Master is shut down before it finishes work, next time it will start from continuing unfinished business. Simple and logical.