Neverending cycle of buffs and nerfs. When will it stop Riot?

Is it just me or are we in a neverending cycle of BS? This is not related to any patchnotes or current changes just something i noticed happens regularly every half a sason to a full season.

New item changes reveal that mages are to strong, and tanks are stronger then them>Tanks are OP>Nerf Tanks>ADCs are OP because tanks got nerfed massivly>Buff Assasins to counterbalance ADCs being OP>Mages get out of control because they stay safe from assasins and have safer lanes and utility which is usefull even when behind> Buff hardcore go-in-deep bruiser champions to act as a counter balance> Meta is in mess and only 3% of champion pool is playable>Nerf several champions at once, while buffing others>Competative play reveals tanks are OP again for their CC and usefull reliable dmg> Nerf tanks....

This is imo what has been happening since s3 and maybe s2. With a few exceptions(mostly some supports and junglers, as well as some full VGU and reworks). Is Riot doing this to keep the game fresh or are they actualy unable to balance the game after so many years???