User blog comment:Lykrast/A suggestion about Flash/@comment-10779726-20130706210009

I don't think this is a good idea for several reasons, mostly because of the inability to flash after damage. Now any time your lane opponent deals damage to you, it's a free 6 second interval for the enemy jungler to run at you, knowing that you can't escape unless you have a built in one.

Second, if you're playing mid lane, it's not going to be hot if the jungler can flash from the push into your face and make you unable to flash away immediately. 600 range is a bit too big for comfort.

Now you may be thinking, that's the point right? Until you see all the champions who depend on flash to escape and lack anything else. Kog'maw, Miss Fortune, Diana, Brand, Lux, Sona, etc. If anything I think the biggest issue with the changes you've outlined is the flash disable after taking damage.

I think the auto-smart cast cancellation is a smart idea though, not sure why riot hasn't made it an option already like they have with summoner spells like ignite and exhaust.