Open market "want to always auto update apps?". No.
Update an app after reading the change log. "want to always auto update apps?". No.
Update the next app... You get the idea.
Also, what's the fallacy about giving you a change log for each version of apps, but not allowing to install other versions? This is the sole reason people will give up those stores. Will not even be the abusive control and price for no added safety.