Well, maybe I am not up to date on this. Are you saying you can see in advance what games will be in a subscription bundle and also that you can skip as many bundles as you want?
That is true. However, my impression was that they started putting most of the good games into the subscription bundles, which makes sense from their perspective, simply to make more people subscribe. So while people could still choose between subscription and non subscription based payment models, Humble systematically decreased the quality and thus attractiveness of the non subscription based bundles more and more, while the great disadvantage of the subscription bundles (not knowing in advance what games you will get) remained.
This reminds me of how I used to buy most humble bundles until they switched to that stupid subscription model that will make you pay without knowing what games you will get for your money.
NOVA DRIFT is easily the best SHMUP if have played in my life and it´s on a 60% discount right now. From the tight controls to the artstyle and the gameplay, everything about this game is perfect and the dev is listening to the community.