I get it, I really do. You don't want to give free champs out.
Yet why is it that every time Riot has the option of making the entire ARAM pool open, they go with a weird change. The change to add the last three pools to ARAM boosting it to 42 doesn't do nearly as much. Yeah, it's nice, but again this is an issue you could fix by allowing _all_ champions enabled for ARAM.
The other changes are great! I just get frustrated with Riot constantly bending over backwards to make sure we don't get all champs enabled. (Especially when they are for Clash???)