I think the communication on ARAM is looking good, but communication on more general gameplay changes, particularly champion reworks, is still spotty. Sure, we're getting these threads announcing imminent changes, and sometimes you'll see some number adjustments pinned down to player feedback, but I have yet to see a single instance of a Rioter implementing major changes to their rework, let alone rolling back a "serious" update in part or in its entirety, from that same feedback. Heimerdinger's changes aren't on the PBE yet, so I can't comment on how they'll evolve, but the Big 3 in the Tank update have received extensive and intense feedback, along with suggestions on how to improve, yet their kits have remained locked in place. It's not quite Mordekaiser levels of pigheadedness, but it's not really major progress either. To this day, PBE still mostly feels like just a testing ground for bugs, rather than any sort of meaningful qualitative gameplay assessment, so even if some "tentative" changes might not always make it to Live, it mostly feels like those decisions are made purely at the devs' discretion, rather than as a result of player feedback.