When playing against full lethality assassins or one shotting mages such as Syndra with R I used to choose the Fearless mastery on squishy champions like ad carries. Overall this helped with surviving the initial burst and added a form of counterplay against burst. In the new rune system this mastery is transformed into the Aftershock keystone, which is aimed towards tanks.
The new rune system having no replacements rune for the Fearless mastery makes it impossible to deal with burst champions as a squishy champion.
I want to know if this was an intentional decision. Especially since snowball champs tend to reign on the PBE at the moment.